diff --git a/src/displayapp/screens/Alarm.cpp b/src/displayapp/screens/Alarm.cpp
index 879e50d8..d5fc2c04 100644
--- a/src/displayapp/screens/Alarm.cpp
+++ b/src/displayapp/screens/Alarm.cpp
@@ -303,7 +303,7 @@ void Alarm::ShowInfo() {
     lv_label_set_text_fmt(
       txtMessage, "Time to\nalarm:\n%2lu Days\n%2lu Hours\n%2lu Minutes\n%2lu Seconds", daysToAlarm, hrsToAlarm, minToAlarm, secToAlarm);
   } else {
-    lv_label_set_text(txtMessage, "Alarm\nis not\nset.");
+    lv_label_set_text_static(txtMessage, "Alarm\nis not\nset.");
   }
 }
 
@@ -317,13 +317,13 @@ void Alarm::SetRecurButtonState() {
   using Pinetime::Controllers::AlarmController;
   switch (alarmController.Recurrence()) {
     case AlarmController::RecurType::None:
-      lv_label_set_text(txtRecur, "ONCE");
+      lv_label_set_text_static(txtRecur, "ONCE");
       break;
     case AlarmController::RecurType::Daily:
-      lv_label_set_text(txtRecur, "DAILY");
+      lv_label_set_text_static(txtRecur, "DAILY");
       break;
     case AlarmController::RecurType::Weekdays:
-      lv_label_set_text(txtRecur, "MON-FRI");
+      lv_label_set_text_static(txtRecur, "MON-FRI");
   }
 }
 
diff --git a/src/displayapp/screens/FirmwareUpdate.cpp b/src/displayapp/screens/FirmwareUpdate.cpp
index 373fcae4..0a8544b3 100644
--- a/src/displayapp/screens/FirmwareUpdate.cpp
+++ b/src/displayapp/screens/FirmwareUpdate.cpp
@@ -15,7 +15,7 @@ FirmwareUpdate::FirmwareUpdate(Pinetime::Applications::DisplayApp* app, Pinetime
   lv_label_set_text_static(backgroundLabel, "");
 
   titleLabel = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_text(titleLabel, "Firmware update");
+  lv_label_set_text_static(titleLabel, "Firmware update");
   lv_obj_set_auto_realign(titleLabel, true);
   lv_obj_align(titleLabel, nullptr, LV_ALIGN_IN_TOP_MID, 0, 50);
 
@@ -27,7 +27,7 @@ FirmwareUpdate::FirmwareUpdate(Pinetime::Applications::DisplayApp* app, Pinetime
   lv_bar_set_value(bar1, 0, LV_ANIM_OFF);
 
   percentLabel = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_text(percentLabel, "Waiting...");
+  lv_label_set_text_static(percentLabel, "Waiting...");
   lv_obj_set_auto_realign(percentLabel, true);
   lv_obj_align(percentLabel, bar1, LV_ALIGN_OUT_TOP_MID, 0, 60);
   taskRefresh = lv_task_create(RefreshTaskCallback, LV_DISP_DEF_REFR_PERIOD, LV_TASK_PRIO_MID, this);
@@ -81,20 +81,19 @@ void FirmwareUpdate::DisplayProgression() const {
   float current = bleController.FirmwareUpdateCurrentBytes() / 1024.0f;
   float total = bleController.FirmwareUpdateTotalBytes() / 1024.0f;
   int16_t pc = (current / total) * 100.0f;
-  sprintf(percentStr, "%d %%", pc);
-  lv_label_set_text(percentLabel, percentStr);
+  lv_label_set_text_fmt(percentLabel, "%d %%", pc);
 
   lv_bar_set_value(bar1, pc, LV_ANIM_OFF);
 }
 
 void FirmwareUpdate::UpdateValidated() {
   lv_label_set_recolor(percentLabel, true);
-  lv_label_set_text(percentLabel, "#00ff00 Image Ok!#");
+  lv_label_set_text_static(percentLabel, "#00ff00 Image Ok!#");
 }
 
 void FirmwareUpdate::UpdateError() {
   lv_label_set_recolor(percentLabel, true);
-  lv_label_set_text(percentLabel, "#ff0000 Error!#");
+  lv_label_set_text_static(percentLabel, "#ff0000 Error!#");
   startTime = xTaskGetTickCount();
 }
 
diff --git a/src/displayapp/screens/FirmwareUpdate.h b/src/displayapp/screens/FirmwareUpdate.h
index a61178ce..5156b7ea 100644
--- a/src/displayapp/screens/FirmwareUpdate.h
+++ b/src/displayapp/screens/FirmwareUpdate.h
@@ -24,7 +24,6 @@ namespace Pinetime {
         lv_obj_t* bar1;
         lv_obj_t* percentLabel;
         lv_obj_t* titleLabel;
-        mutable char percentStr[10];
 
         States state = States::Idle;
 
diff --git a/src/displayapp/screens/FirmwareValidation.cpp b/src/displayapp/screens/FirmwareValidation.cpp
index c7a5b27e..16244ad5 100644
--- a/src/displayapp/screens/FirmwareValidation.cpp
+++ b/src/displayapp/screens/FirmwareValidation.cpp
@@ -33,9 +33,9 @@ FirmwareValidation::FirmwareValidation(Pinetime::Applications::DisplayApp* app,
   lv_obj_set_width(labelIsValidated, 240);
 
   if (validator.IsValidated())
-    lv_label_set_text(labelIsValidated, "You have already\n#00ff00 validated# this firmware#");
+    lv_label_set_text_static(labelIsValidated, "You have already\n#00ff00 validated# this firmware#");
   else {
-    lv_label_set_text(labelIsValidated, "Please #00ff00 Validate# this version or\n#ff0000 Reset# to rollback to the previous version.");
+    lv_label_set_text_static(labelIsValidated, "Please #00ff00 Validate# this version or\n#ff0000 Reset# to rollback to the previous version.");
 
     buttonValidate = lv_btn_create(lv_scr_act(), nullptr);
     buttonValidate->user_data = this;
diff --git a/src/displayapp/screens/FlashLight.cpp b/src/displayapp/screens/FlashLight.cpp
index c4d02643..0634187d 100644
--- a/src/displayapp/screens/FlashLight.cpp
+++ b/src/displayapp/screens/FlashLight.cpp
@@ -45,7 +45,7 @@ FlashLight::FlashLight(Pinetime::Applications::DisplayApp* app,
   lv_label_set_long_mode(backgroundAction, LV_LABEL_LONG_CROP);
   lv_obj_set_size(backgroundAction, 240, 240);
   lv_obj_set_pos(backgroundAction, 0, 0);
-  lv_label_set_text(backgroundAction, "");
+  lv_label_set_text_static(backgroundAction, "");
   lv_obj_set_click(backgroundAction, true);
   backgroundAction->user_data = this;
   lv_obj_set_event_cb(backgroundAction, event_handler);
diff --git a/src/displayapp/screens/HeartRate.cpp b/src/displayapp/screens/HeartRate.cpp
index 513c40bf..89b43bb5 100644
--- a/src/displayapp/screens/HeartRate.cpp
+++ b/src/displayapp/screens/HeartRate.cpp
@@ -41,16 +41,16 @@ HeartRate::HeartRate(Pinetime::Applications::DisplayApp* app,
   else
     lv_obj_set_style_local_text_color(label_hr, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GRAY);
 
-  lv_label_set_text(label_hr, "000");
+  lv_label_set_text_static(label_hr, "000");
   lv_obj_align(label_hr, nullptr, LV_ALIGN_CENTER, 0, -40);
 
   label_bpm = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_text(label_bpm, "Heart rate BPM");
+  lv_label_set_text_static(label_bpm, "Heart rate BPM");
   lv_obj_align(label_bpm, label_hr, LV_ALIGN_OUT_TOP_MID, 0, -20);
 
   label_status = lv_label_create(lv_scr_act(), nullptr);
   lv_obj_set_style_local_text_color(label_status, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, lv_color_hex(0x222222));
-  lv_label_set_text(label_status, ToString(Pinetime::Controllers::HeartRateController::States::NotEnoughData));
+  lv_label_set_text_static(label_status, ToString(Pinetime::Controllers::HeartRateController::States::NotEnoughData));
 
   lv_obj_align(label_status, label_hr, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
 
@@ -81,13 +81,13 @@ void HeartRate::Refresh() {
     case Controllers::HeartRateController::States::NoTouch:
     case Controllers::HeartRateController::States::NotEnoughData:
       // case Controllers::HeartRateController::States::Stopped:
-      lv_label_set_text(label_hr, "000");
+      lv_label_set_text_static(label_hr, "000");
       break;
     default:
       lv_label_set_text_fmt(label_hr, "%03d", heartRateController.HeartRate());
   }
 
-  lv_label_set_text(label_status, ToString(state));
+  lv_label_set_text_static(label_status, ToString(state));
   lv_obj_align(label_status, label_hr, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
 }
 
@@ -109,7 +109,7 @@ void HeartRate::OnStartStopEvent(lv_event_t event) {
 
 void HeartRate::UpdateStartStopButton(bool isRunning) {
   if (isRunning)
-    lv_label_set_text(label_startStop, "Stop");
+    lv_label_set_text_static(label_startStop, "Stop");
   else
-    lv_label_set_text(label_startStop, "Start");
+    lv_label_set_text_static(label_startStop, "Start");
 }
diff --git a/src/displayapp/screens/Motion.cpp b/src/displayapp/screens/Motion.cpp
index 23eb2765..799dcb3b 100644
--- a/src/displayapp/screens/Motion.cpp
+++ b/src/displayapp/screens/Motion.cpp
@@ -35,7 +35,7 @@ Motion::Motion(Pinetime::Applications::DisplayApp* app, Controllers::MotionContr
 
   labelStep = lv_label_create(lv_scr_act(), NULL);
   lv_obj_align(labelStep, chart, LV_ALIGN_IN_BOTTOM_LEFT, 0, 0);
-  lv_label_set_text(labelStep, "Steps ---");
+  lv_label_set_text_static(labelStep, "Steps ---");
 
   taskRefresh = lv_task_create(RefreshTaskCallback, LV_DISP_DEF_REFR_PERIOD, LV_TASK_PRIO_MID, this);
 }
diff --git a/src/displayapp/screens/Music.cpp b/src/displayapp/screens/Music.cpp
index 9f17b956..dd4609cf 100644
--- a/src/displayapp/screens/Music.cpp
+++ b/src/displayapp/screens/Music.cpp
@@ -62,7 +62,7 @@ Music::Music(Pinetime::Applications::DisplayApp* app, Pinetime::Controllers::Mus
   lv_obj_align(btnVolDown, nullptr, LV_ALIGN_IN_BOTTOM_LEFT, 0, 0);
   lv_obj_add_style(btnVolDown, LV_STATE_DEFAULT, &btn_style);
   label = lv_label_create(btnVolDown, nullptr);
-  lv_label_set_text(label, Symbols::volumDown);
+  lv_label_set_text_static(label, Symbols::volumDown);
   lv_obj_set_hidden(btnVolDown, true);
 
   btnVolUp = lv_btn_create(lv_scr_act(), nullptr);
@@ -72,7 +72,7 @@ Music::Music(Pinetime::Applications::DisplayApp* app, Pinetime::Controllers::Mus
   lv_obj_align(btnVolUp, nullptr, LV_ALIGN_IN_BOTTOM_RIGHT, 0, 0);
   lv_obj_add_style(btnVolUp, LV_STATE_DEFAULT, &btn_style);
   label = lv_label_create(btnVolUp, nullptr);
-  lv_label_set_text(label, Symbols::volumUp);
+  lv_label_set_text_static(label, Symbols::volumUp);
   lv_obj_set_hidden(btnVolUp, true);
 
   btnPrev = lv_btn_create(lv_scr_act(), nullptr);
@@ -82,7 +82,7 @@ Music::Music(Pinetime::Applications::DisplayApp* app, Pinetime::Controllers::Mus
   lv_obj_align(btnPrev, nullptr, LV_ALIGN_IN_BOTTOM_LEFT, 0, 0);
   lv_obj_add_style(btnPrev, LV_STATE_DEFAULT, &btn_style);
   label = lv_label_create(btnPrev, nullptr);
-  lv_label_set_text(label, Symbols::stepBackward);
+  lv_label_set_text_static(label, Symbols::stepBackward);
 
   btnNext = lv_btn_create(lv_scr_act(), nullptr);
   btnNext->user_data = this;
@@ -91,7 +91,7 @@ Music::Music(Pinetime::Applications::DisplayApp* app, Pinetime::Controllers::Mus
   lv_obj_align(btnNext, nullptr, LV_ALIGN_IN_BOTTOM_RIGHT, 0, 0);
   lv_obj_add_style(btnNext, LV_STATE_DEFAULT, &btn_style);
   label = lv_label_create(btnNext, nullptr);
-  lv_label_set_text(label, Symbols::stepForward);
+  lv_label_set_text_static(label, Symbols::stepForward);
 
   btnPlayPause = lv_btn_create(lv_scr_act(), nullptr);
   btnPlayPause->user_data = this;
@@ -100,12 +100,12 @@ Music::Music(Pinetime::Applications::DisplayApp* app, Pinetime::Controllers::Mus
   lv_obj_align(btnPlayPause, nullptr, LV_ALIGN_IN_BOTTOM_MID, 0, 0);
   lv_obj_add_style(btnPlayPause, LV_STATE_DEFAULT, &btn_style);
   txtPlayPause = lv_label_create(btnPlayPause, nullptr);
-  lv_label_set_text(txtPlayPause, Symbols::play);
+  lv_label_set_text_static(txtPlayPause, Symbols::play);
 
   txtTrackDuration = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_long_mode(txtTrackDuration, LV_LABEL_LONG_SROLL);
   lv_obj_align(txtTrackDuration, nullptr, LV_ALIGN_IN_TOP_LEFT, 12, 20);
-  lv_label_set_text(txtTrackDuration, "--:--/--:--");
+  lv_label_set_text_static(txtTrackDuration, "--:--/--:--");
   lv_label_set_align(txtTrackDuration, LV_ALIGN_IN_LEFT_MID);
   lv_obj_set_width(txtTrackDuration, LV_HOR_RES);
 
@@ -117,7 +117,7 @@ Music::Music(Pinetime::Applications::DisplayApp* app, Pinetime::Controllers::Mus
   lv_obj_align(txtArtist, nullptr, LV_ALIGN_IN_LEFT_MID, 12, MIDDLE_OFFSET + 1 * FONT_HEIGHT);
   lv_label_set_align(txtArtist, LV_ALIGN_IN_LEFT_MID);
   lv_obj_set_width(txtArtist, LV_HOR_RES - 12);
-  lv_label_set_text(txtArtist, "Artist Name");
+  lv_label_set_text_static(txtArtist, "Artist Name");
 
   txtTrack = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_long_mode(txtTrack, LV_LABEL_LONG_SROLL_CIRC);
@@ -125,7 +125,7 @@ Music::Music(Pinetime::Applications::DisplayApp* app, Pinetime::Controllers::Mus
 
   lv_label_set_align(txtTrack, LV_ALIGN_IN_LEFT_MID);
   lv_obj_set_width(txtTrack, LV_HOR_RES - 12);
-  lv_label_set_text(txtTrack, "This is a very long getTrack name");
+  lv_label_set_text_static(txtTrack, "This is a very long getTrack name");
 
   /** Init animation */
   imgDisc = lv_img_create(lv_scr_act(), nullptr);
@@ -187,7 +187,7 @@ void Music::Refresh() {
   }
 
   if (playing == Pinetime::Controllers::MusicService::MusicStatus::Playing) {
-    lv_label_set_text(txtPlayPause, Symbols::pause);
+    lv_label_set_text_static(txtPlayPause, Symbols::pause);
     if (xTaskGetTickCount() - 1024 >= lastIncrement) {
 
       if (frameB) {
@@ -211,31 +211,27 @@ void Music::Refresh() {
       UpdateLength();
     }
   } else {
-    lv_label_set_text(txtPlayPause, Symbols::play);
+    lv_label_set_text_static(txtPlayPause, Symbols::play);
   }
 }
 
 void Music::UpdateLength() {
   if (totalLength > (99 * 60 * 60)) {
-    lv_label_set_text(txtTrackDuration, "Inf/Inf");
+    lv_label_set_text_static(txtTrackDuration, "Inf/Inf");
   } else if (totalLength > (99 * 60)) {
-    char timer[12];
-    sprintf(timer,
-            "%02d:%02d/%02d:%02d",
-            (currentLength / (60 * 60)) % 100,
-            ((currentLength % (60 * 60)) / 60) % 100,
-            (totalLength / (60 * 60)) % 100,
-            ((totalLength % (60 * 60)) / 60) % 100);
-    lv_label_set_text(txtTrackDuration, timer);
+    lv_label_set_text_fmt(txtTrackDuration,
+                          "%02d:%02d/%02d:%02d",
+                          (currentLength / (60 * 60)) % 100,
+                          ((currentLength % (60 * 60)) / 60) % 100,
+                          (totalLength / (60 * 60)) % 100,
+                          ((totalLength % (60 * 60)) / 60) % 100);
   } else {
-    char timer[12];
-    sprintf(timer,
-            "%02d:%02d/%02d:%02d",
-            (currentLength / 60) % 100,
-            (currentLength % 60) % 100,
-            (totalLength / 60) % 100,
-            (totalLength % 60) % 100);
-    lv_label_set_text(txtTrackDuration, timer);
+    lv_label_set_text_fmt(txtTrackDuration,
+                          "%02d:%02d/%02d:%02d",
+                          (currentLength / 60) % 100,
+                          (currentLength % 60) % 100,
+                          (totalLength / 60) % 100,
+                          (totalLength % 60) % 100);
   }
 }
 
diff --git a/src/displayapp/screens/Navigation.cpp b/src/displayapp/screens/Navigation.cpp
index 674362a6..0dd0d303 100644
--- a/src/displayapp/screens/Navigation.cpp
+++ b/src/displayapp/screens/Navigation.cpp
@@ -134,13 +134,13 @@ Navigation::Navigation(Pinetime::Applications::DisplayApp* app, Pinetime::Contro
   imgFlag = lv_label_create(lv_scr_act(), nullptr);
   lv_obj_set_style_local_text_font(imgFlag, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &lv_font_navi_80);
   lv_obj_set_style_local_text_color(imgFlag, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_CYAN);
-  lv_label_set_text(imgFlag, iconForName("flag"));
+  lv_label_set_text_static(imgFlag, iconForName("flag"));
   lv_obj_align(imgFlag, nullptr, LV_ALIGN_CENTER, 0, -60);
 
   txtNarrative = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_long_mode(txtNarrative, LV_LABEL_LONG_BREAK);
   lv_obj_set_width(txtNarrative, LV_HOR_RES);
-  lv_label_set_text(txtNarrative, "Navigation");
+  lv_label_set_text_static(txtNarrative, "Navigation");
   lv_label_set_align(txtNarrative, LV_LABEL_ALIGN_CENTER);
   lv_obj_align(txtNarrative, nullptr, LV_ALIGN_CENTER, 0, 10);
 
@@ -148,7 +148,7 @@ Navigation::Navigation(Pinetime::Applications::DisplayApp* app, Pinetime::Contro
   lv_label_set_long_mode(txtManDist, LV_LABEL_LONG_BREAK);
   lv_obj_set_style_local_text_color(txtManDist, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GREEN);
   lv_obj_set_width(txtManDist, LV_HOR_RES);
-  lv_label_set_text(txtManDist, "--M");
+  lv_label_set_text_static(txtManDist, "--M");
   lv_label_set_align(txtManDist, LV_LABEL_ALIGN_CENTER);
   lv_obj_align(txtManDist, nullptr, LV_ALIGN_CENTER, 0, 60);
 
@@ -173,7 +173,7 @@ Navigation::~Navigation() {
 void Navigation::Refresh() {
   if (flag != navService.getFlag()) {
     flag = navService.getFlag();
-    lv_label_set_text(imgFlag, iconForName(flag));
+    lv_label_set_text_static(imgFlag, iconForName(flag));
   }
 
   if (narrative != navService.getNarrative()) {
diff --git a/src/displayapp/screens/Notifications.cpp b/src/displayapp/screens/Notifications.cpp
index f9afd8c7..600f7488 100644
--- a/src/displayapp/screens/Notifications.cpp
+++ b/src/displayapp/screens/Notifications.cpp
@@ -229,7 +229,7 @@ Notifications::NotificationItem::NotificationItem(const char* title,
       lv_obj_set_style_local_text_color(alert_subject, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_ORANGE);
       lv_label_set_long_mode(alert_subject, LV_LABEL_LONG_BREAK);
       lv_obj_set_width(alert_subject, LV_HOR_RES - 20);
-      lv_label_set_text(alert_subject, "Incoming call from");
+      lv_label_set_text_static(alert_subject, "Incoming call from");
 
       lv_obj_t* alert_caller = lv_label_create(container1, nullptr);
       lv_obj_align(alert_caller, alert_subject, LV_ALIGN_OUT_BOTTOM_LEFT, 0, 0);
@@ -243,7 +243,7 @@ Notifications::NotificationItem::NotificationItem(const char* title,
       lv_obj_set_size(bt_accept, 76, 76);
       lv_obj_align(bt_accept, NULL, LV_ALIGN_IN_BOTTOM_LEFT, 0, 0);
       label_accept = lv_label_create(bt_accept, nullptr);
-      lv_label_set_text(label_accept, Symbols::phone);
+      lv_label_set_text_static(label_accept, Symbols::phone);
       lv_obj_set_style_local_bg_color(bt_accept, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GREEN);
 
       bt_reject = lv_btn_create(lv_scr_act(), nullptr);
@@ -252,7 +252,7 @@ Notifications::NotificationItem::NotificationItem(const char* title,
       lv_obj_set_size(bt_reject, 76, 76);
       lv_obj_align(bt_reject, NULL, LV_ALIGN_IN_BOTTOM_MID, 0, 0);
       label_reject = lv_label_create(bt_reject, nullptr);
-      lv_label_set_text(label_reject, Symbols::phoneSlash);
+      lv_label_set_text_static(label_reject, Symbols::phoneSlash);
       lv_obj_set_style_local_bg_color(bt_reject, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_RED);
 
       bt_mute = lv_btn_create(lv_scr_act(), nullptr);
@@ -261,7 +261,7 @@ Notifications::NotificationItem::NotificationItem(const char* title,
       lv_obj_set_size(bt_mute, 76, 76);
       lv_obj_align(bt_mute, NULL, LV_ALIGN_IN_BOTTOM_RIGHT, 0, 0);
       label_mute = lv_label_create(bt_mute, nullptr);
-      lv_label_set_text(label_mute, Symbols::volumMute);
+      lv_label_set_text_static(label_mute, Symbols::volumMute);
       lv_obj_set_style_local_bg_color(bt_mute, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GRAY);
     } break;
   }
@@ -270,7 +270,7 @@ Notifications::NotificationItem::NotificationItem(const char* title,
   lv_label_set_long_mode(backgroundLabel, LV_LABEL_LONG_CROP);
   lv_obj_set_size(backgroundLabel, 240, 240);
   lv_obj_set_pos(backgroundLabel, 0, 0);
-  lv_label_set_text(backgroundLabel, "");
+  lv_label_set_text_static(backgroundLabel, "");
 }
 
 void Notifications::NotificationItem::OnCallButtonEvent(lv_obj_t* obj, lv_event_t event) {
diff --git a/src/displayapp/screens/Paddle.cpp b/src/displayapp/screens/Paddle.cpp
index 608eb644..79401ff9 100644
--- a/src/displayapp/screens/Paddle.cpp
+++ b/src/displayapp/screens/Paddle.cpp
@@ -17,7 +17,7 @@ Paddle::Paddle(Pinetime::Applications::DisplayApp* app, Pinetime::Components::Li
 
   points = lv_label_create(lv_scr_act(), nullptr);
   lv_obj_set_style_local_text_font(points, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &jetbrains_mono_42);
-  lv_label_set_text(points, "0000");
+  lv_label_set_text_static(points, "0000");
   lv_obj_align(points, lv_scr_act(), LV_ALIGN_IN_TOP_MID, 0, 10);
 
   paddle = lv_obj_create(lv_scr_act(), nullptr);
diff --git a/src/displayapp/screens/PassKey.cpp b/src/displayapp/screens/PassKey.cpp
index 9e43a541..e9715cd6 100644
--- a/src/displayapp/screens/PassKey.cpp
+++ b/src/displayapp/screens/PassKey.cpp
@@ -15,7 +15,7 @@ PassKey::PassKey(Pinetime::Applications::DisplayApp* app, uint32_t key) : Screen
   lv_label_set_long_mode(backgroundLabel, LV_LABEL_LONG_CROP);
   lv_obj_set_size(backgroundLabel, 240, 240);
   lv_obj_set_pos(backgroundLabel, 0, 0);
-  lv_label_set_text(backgroundLabel, "");
+  lv_label_set_text_static(backgroundLabel, "");
 }
 
 PassKey::~PassKey() {
diff --git a/src/displayapp/screens/Steps.cpp b/src/displayapp/screens/Steps.cpp
index 3e7f8201..df137585 100644
--- a/src/displayapp/screens/Steps.cpp
+++ b/src/displayapp/screens/Steps.cpp
@@ -61,7 +61,7 @@ Steps::Steps(Pinetime::Applications::DisplayApp* app,
   lv_obj_set_width(resetBtn, 115);
   lv_obj_align(resetBtn, lv_scr_act(), LV_ALIGN_IN_BOTTOM_MID, 0, 0);
   resetButtonLabel = lv_label_create(resetBtn, nullptr);
-  lv_label_set_text(resetButtonLabel, "Reset");
+  lv_label_set_text_static(resetButtonLabel, "Reset");
 
   currentTripSteps = motionController.GetTripSteps();
 
diff --git a/src/displayapp/screens/StopWatch.cpp b/src/displayapp/screens/StopWatch.cpp
index 8749839f..fcff5f12 100644
--- a/src/displayapp/screens/StopWatch.cpp
+++ b/src/displayapp/screens/StopWatch.cpp
@@ -55,13 +55,13 @@ StopWatch::StopWatch(DisplayApp* app, System::SystemTask& systemTask)
   time = lv_label_create(lv_scr_act(), nullptr);
   lv_obj_set_style_local_text_font(time, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &jetbrains_mono_76);
   lv_obj_set_style_local_text_color(time, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GRAY);
-  lv_label_set_text(time, "00:00");
+  lv_label_set_text_static(time, "00:00");
   lv_obj_align(time, lv_scr_act(), LV_ALIGN_CENTER, 0, -45);
 
   msecTime = lv_label_create(lv_scr_act(), nullptr);
   // lv_obj_set_style_local_text_font(msecTime, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &jetbrains_mono_bold_20);
   lv_obj_set_style_local_text_color(msecTime, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GRAY);
-  lv_label_set_text(msecTime, "00");
+  lv_label_set_text_static(msecTime, "00");
   lv_obj_align(msecTime, lv_scr_act(), LV_ALIGN_CENTER, 0, 3);
 
   btnPlayPause = lv_btn_create(lv_scr_act(), nullptr);
@@ -71,7 +71,7 @@ StopWatch::StopWatch(DisplayApp* app, System::SystemTask& systemTask)
   lv_obj_set_width(btnPlayPause, 115);
   lv_obj_align(btnPlayPause, lv_scr_act(), LV_ALIGN_IN_BOTTOM_RIGHT, 0, 0);
   txtPlayPause = lv_label_create(btnPlayPause, nullptr);
-  lv_label_set_text(txtPlayPause, Symbols::play);
+  lv_label_set_text_static(txtPlayPause, Symbols::play);
 
   btnStopLap = lv_btn_create(lv_scr_act(), nullptr);
   btnStopLap->user_data = this;
@@ -82,7 +82,7 @@ StopWatch::StopWatch(DisplayApp* app, System::SystemTask& systemTask)
   lv_obj_set_style_local_bg_color(btnStopLap, LV_BTN_PART_MAIN, LV_STATE_DISABLED, lv_color_hex(0x080808));
   txtStopLap = lv_label_create(btnStopLap, nullptr);
   lv_obj_set_style_local_text_color(txtStopLap, LV_BTN_PART_MAIN, LV_STATE_DISABLED, lv_color_hex(0x888888));
-  lv_label_set_text(txtStopLap, Symbols::stop);
+  lv_label_set_text_static(txtStopLap, Symbols::stop);
   lv_obj_set_state(btnStopLap, LV_STATE_DISABLED);
   lv_obj_set_state(txtStopLap, LV_STATE_DISABLED);
 
@@ -90,13 +90,13 @@ StopWatch::StopWatch(DisplayApp* app, System::SystemTask& systemTask)
   // lv_obj_set_style_local_text_font(lapOneText, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &jetbrains_mono_bold_20);
   lv_obj_set_style_local_text_color(lapOneText, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_YELLOW);
   lv_obj_align(lapOneText, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 50, 30);
-  lv_label_set_text(lapOneText, "");
+  lv_label_set_text_static(lapOneText, "");
 
   lapTwoText = lv_label_create(lv_scr_act(), nullptr);
   // lv_obj_set_style_local_text_font(lapTwoText, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &jetbrains_mono_bold_20);
   lv_obj_set_style_local_text_color(lapTwoText, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_YELLOW);
   lv_obj_align(lapTwoText, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 50, 55);
-  lv_label_set_text(lapTwoText, "");
+  lv_label_set_text_static(lapTwoText, "");
 
   taskRefresh = lv_task_create(RefreshTaskCallback, LV_DISP_DEF_REFR_PERIOD, LV_TASK_PRIO_MID, this);
 }
@@ -113,11 +113,11 @@ void StopWatch::reset() {
   lv_obj_set_style_local_text_color(time, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GRAY);
   lv_obj_set_style_local_text_color(msecTime, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GRAY);
 
-  lv_label_set_text(time, "00:00");
-  lv_label_set_text(msecTime, "00");
+  lv_label_set_text_static(time, "00:00");
+  lv_label_set_text_static(msecTime, "00");
 
-  lv_label_set_text(lapOneText, "");
-  lv_label_set_text(lapTwoText, "");
+  lv_label_set_text_static(lapOneText, "");
+  lv_label_set_text_static(lapTwoText, "");
   lapBuffer.clearBuffer();
   lapNr = 0;
   lv_obj_set_state(btnStopLap, LV_STATE_DISABLED);
@@ -129,8 +129,8 @@ void StopWatch::start() {
   lv_obj_set_state(txtStopLap, LV_STATE_DEFAULT);
   lv_obj_set_style_local_text_color(time, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GREEN);
   lv_obj_set_style_local_text_color(msecTime, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GREEN);
-  lv_label_set_text(txtPlayPause, Symbols::pause);
-  lv_label_set_text(txtStopLap, Symbols::lapsFlag);
+  lv_label_set_text_static(txtPlayPause, Symbols::pause);
+  lv_label_set_text_static(txtStopLap, Symbols::lapsFlag);
   startTime = xTaskGetTickCount();
   currentState = States::Running;
   systemTask.PushMessage(Pinetime::System::Messages::DisableSleeping);
@@ -141,8 +141,8 @@ void StopWatch::pause() {
   // Store the current time elapsed in cache
   oldTimeElapsed += timeElapsed;
   currentState = States::Halted;
-  lv_label_set_text(txtPlayPause, Symbols::play);
-  lv_label_set_text(txtStopLap, Symbols::stop);
+  lv_label_set_text_static(txtPlayPause, Symbols::play);
+  lv_label_set_text_static(txtStopLap, Symbols::stop);
   lv_obj_set_style_local_text_color(time, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_YELLOW);
   lv_obj_set_style_local_text_color(msecTime, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_YELLOW);
   systemTask.PushMessage(Pinetime::System::Messages::EnableSleeping);
diff --git a/src/displayapp/screens/Tile.cpp b/src/displayapp/screens/Tile.cpp
index 23d9bca7..4df69fed 100644
--- a/src/displayapp/screens/Tile.cpp
+++ b/src/displayapp/screens/Tile.cpp
@@ -39,7 +39,7 @@ Tile::Tile(uint8_t screenID,
 
   // Battery
   batteryIcon = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_text(batteryIcon, BatteryIcon::GetBatteryIcon(batteryController.PercentRemaining()));
+  lv_label_set_text_static(batteryIcon, BatteryIcon::GetBatteryIcon(batteryController.PercentRemaining()));
   lv_obj_align(batteryIcon, nullptr, LV_ALIGN_IN_TOP_RIGHT, -8, 0);
 
   if (numScreens > 1) {
@@ -120,7 +120,7 @@ Tile::~Tile() {
 
 void Tile::UpdateScreen() {
   lv_label_set_text(label_time, dateTimeController.FormattedTime().c_str());
-  lv_label_set_text(batteryIcon, BatteryIcon::GetBatteryIcon(batteryController.PercentRemaining()));
+  lv_label_set_text_static(batteryIcon, BatteryIcon::GetBatteryIcon(batteryController.PercentRemaining()));
 }
 
 void Tile::OnValueChangedEvent(lv_obj_t* obj, uint32_t buttonId) {
diff --git a/src/displayapp/screens/Timer.cpp b/src/displayapp/screens/Timer.cpp
index 5cd496c7..167b7b1e 100644
--- a/src/displayapp/screens/Timer.cpp
+++ b/src/displayapp/screens/Timer.cpp
@@ -18,7 +18,7 @@ void Timer::CreateButtons() {
   lv_obj_set_height(btnMinutesUp, 40);
   lv_obj_set_width(btnMinutesUp, 60);
   txtMUp = lv_label_create(btnMinutesUp, nullptr);
-  lv_label_set_text(txtMUp, "+");
+  lv_label_set_text_static(txtMUp, "+");
 
   btnMinutesDown = lv_btn_create(lv_scr_act(), nullptr);
   btnMinutesDown->user_data = this;
@@ -27,7 +27,7 @@ void Timer::CreateButtons() {
   lv_obj_set_height(btnMinutesDown, 40);
   lv_obj_set_width(btnMinutesDown, 60);
   txtMDown = lv_label_create(btnMinutesDown, nullptr);
-  lv_label_set_text(txtMDown, "-");
+  lv_label_set_text_static(txtMDown, "-");
 
   btnSecondsUp = lv_btn_create(lv_scr_act(), nullptr);
   btnSecondsUp->user_data = this;
@@ -36,7 +36,7 @@ void Timer::CreateButtons() {
   lv_obj_set_height(btnSecondsUp, 40);
   lv_obj_set_width(btnSecondsUp, 60);
   txtSUp = lv_label_create(btnSecondsUp, nullptr);
-  lv_label_set_text(txtSUp, "+");
+  lv_label_set_text_static(txtSUp, "+");
 
   btnSecondsDown = lv_btn_create(lv_scr_act(), nullptr);
   btnSecondsDown->user_data = this;
@@ -45,7 +45,7 @@ void Timer::CreateButtons() {
   lv_obj_set_height(btnSecondsDown, 40);
   lv_obj_set_width(btnSecondsDown, 60);
   txtSDown = lv_label_create(btnSecondsDown, nullptr);
-  lv_label_set_text(txtSDown, "-");
+  lv_label_set_text_static(txtSDown, "-");
 }
 
 Timer::Timer(DisplayApp* app, Controllers::TimerController& timerController)
@@ -55,7 +55,7 @@ Timer::Timer(DisplayApp* app, Controllers::TimerController& timerController)
   lv_label_set_long_mode(backgroundLabel, LV_LABEL_LONG_CROP);
   lv_obj_set_size(backgroundLabel, 240, 240);
   lv_obj_set_pos(backgroundLabel, 0, 0);
-  lv_label_set_text(backgroundLabel, "");
+  lv_label_set_text_static(backgroundLabel, "");
 
   time = lv_label_create(lv_scr_act(), nullptr);
   lv_obj_set_style_local_text_font(time, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &jetbrains_mono_76);
@@ -73,9 +73,9 @@ Timer::Timer(DisplayApp* app, Controllers::TimerController& timerController)
   lv_obj_set_height(btnPlayPause, 40);
   txtPlayPause = lv_label_create(btnPlayPause, nullptr);
   if (timerController.IsRunning()) {
-    lv_label_set_text(txtPlayPause, Symbols::pause);
+    lv_label_set_text_static(txtPlayPause, Symbols::pause);
   } else {
-    lv_label_set_text(txtPlayPause, Symbols::play);
+    lv_label_set_text_static(txtPlayPause, Symbols::play);
     CreateButtons();
   }
 
@@ -98,7 +98,7 @@ void Timer::OnButtonEvent(lv_obj_t* obj, lv_event_t event) {
   if (event == LV_EVENT_CLICKED) {
     if (obj == btnPlayPause) {
       if (timerController.IsRunning()) {
-        lv_label_set_text(txtPlayPause, Symbols::play);
+        lv_label_set_text_static(txtPlayPause, Symbols::play);
         uint32_t seconds = timerController.GetTimeRemaining() / 1000;
         minutesToSet = seconds / 60;
         secondsToSet = seconds % 60;
@@ -106,7 +106,7 @@ void Timer::OnButtonEvent(lv_obj_t* obj, lv_event_t event) {
         CreateButtons();
 
       } else if (secondsToSet + minutesToSet > 0) {
-        lv_label_set_text(txtPlayPause, Symbols::pause);
+        lv_label_set_text_static(txtPlayPause, Symbols::pause);
         timerController.StartTimer((secondsToSet + minutesToSet * 60) * 1000);
 
         lv_obj_del(btnSecondsDown);
@@ -158,8 +158,8 @@ void Timer::OnButtonEvent(lv_obj_t* obj, lv_event_t event) {
 }
 
 void Timer::SetDone() {
-  lv_label_set_text(time, "00:00");
-  lv_label_set_text(txtPlayPause, Symbols::play);
+  lv_label_set_text_static(time, "00:00");
+  lv_label_set_text_static(txtPlayPause, Symbols::play);
   secondsToSet = 0;
   minutesToSet = 0;
   CreateButtons();
diff --git a/src/displayapp/screens/Twos.cpp b/src/displayapp/screens/Twos.cpp
index 6d675859..ca9295d5 100644
--- a/src/displayapp/screens/Twos.cpp
+++ b/src/displayapp/screens/Twos.cpp
@@ -90,7 +90,7 @@ Twos::Twos(Pinetime::Applications::DisplayApp* app) : Screen(app) {
   lv_label_set_long_mode(backgroundLabel, LV_LABEL_LONG_CROP);
   lv_obj_set_size(backgroundLabel, 240, 240);
   lv_obj_set_pos(backgroundLabel, 0, 0);
-  lv_label_set_text(backgroundLabel, "");
+  lv_label_set_text_static(backgroundLabel, "");
 }
 
 Twos::~Twos() {
diff --git a/src/displayapp/screens/WatchFaceAnalog.cpp b/src/displayapp/screens/WatchFaceAnalog.cpp
index 61042816..4cfc9692 100644
--- a/src/displayapp/screens/WatchFaceAnalog.cpp
+++ b/src/displayapp/screens/WatchFaceAnalog.cpp
@@ -67,13 +67,13 @@ WatchFaceAnalog::WatchFaceAnalog(Pinetime::Applications::DisplayApp* app,
   lv_obj_align(bg_clock_img, NULL, LV_ALIGN_CENTER, 0, 0);
 
   batteryIcon = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_text(batteryIcon, Symbols::batteryHalf);
+  lv_label_set_text_static(batteryIcon, Symbols::batteryHalf);
   lv_obj_align(batteryIcon, NULL, LV_ALIGN_IN_TOP_RIGHT, 0, 0);
   lv_obj_set_auto_realign(batteryIcon, true);
 
   notificationIcon = lv_label_create(lv_scr_act(), NULL);
   lv_obj_set_style_local_text_color(notificationIcon, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, lv_color_hex(0x00FF00));
-  lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(false));
+  lv_label_set_text_static(notificationIcon, NotificationIcon::GetIcon(false));
   lv_obj_align(notificationIcon, NULL, LV_ALIGN_IN_TOP_LEFT, 0, 0);
 
   // Date - Day / Week day
@@ -185,7 +185,7 @@ void WatchFaceAnalog::SetBatteryIcon() {
   } else {
     lv_obj_set_style_local_text_color(batteryIcon, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_WHITE);
   }
-  lv_label_set_text(batteryIcon, BatteryIcon::GetBatteryIcon(batteryPercent));
+  lv_label_set_text_static(batteryIcon, BatteryIcon::GetBatteryIcon(batteryPercent));
 }
 
 void WatchFaceAnalog::Refresh() {
@@ -193,7 +193,7 @@ void WatchFaceAnalog::Refresh() {
   if (isCharging.IsUpdated()) {
     if (isCharging.Get()) {
       lv_obj_set_style_local_text_color(batteryIcon, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_RED);
-      lv_label_set_text(batteryIcon, Symbols::plug);
+      lv_label_set_text_static(batteryIcon, Symbols::plug);
     } else {
       SetBatteryIcon();
     }
@@ -208,7 +208,7 @@ void WatchFaceAnalog::Refresh() {
   notificationState = notificationManager.AreNewNotificationsAvailable();
 
   if (notificationState.IsUpdated()) {
-    lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(notificationState.Get()));
+    lv_label_set_text_static(notificationIcon, NotificationIcon::GetIcon(notificationState.Get()));
   }
 
   currentDateTime = dateTimeController.CurrentDateTime();
diff --git a/src/displayapp/screens/WatchFaceDigital.cpp b/src/displayapp/screens/WatchFaceDigital.cpp
index 6a914884..ad328e1a 100644
--- a/src/displayapp/screens/WatchFaceDigital.cpp
+++ b/src/displayapp/screens/WatchFaceDigital.cpp
@@ -121,7 +121,7 @@ void WatchFaceDigital::Refresh() {
   bleState = bleController.IsConnected();
   bleRadioEnabled = bleController.IsRadioEnabled();
   if (bleState.IsUpdated() || bleRadioEnabled.IsUpdated()) {
-    lv_label_set_text(bleIcon, BleIcon::GetIcon(bleState.Get()));
+    lv_label_set_text_static(bleIcon, BleIcon::GetIcon(bleState.Get()));
   }
   lv_obj_realign(batteryIcon);
   lv_obj_realign(batteryPlug);
diff --git a/src/displayapp/screens/WatchFacePineTimeStyle.cpp b/src/displayapp/screens/WatchFacePineTimeStyle.cpp
index d0fbf059..28e7a6a3 100644
--- a/src/displayapp/screens/WatchFacePineTimeStyle.cpp
+++ b/src/displayapp/screens/WatchFacePineTimeStyle.cpp
@@ -373,7 +373,7 @@ void WatchFacePineTimeStyle::Refresh() {
   bleState = bleController.IsConnected();
   bleRadioEnabled = bleController.IsRadioEnabled();
   if (bleState.IsUpdated() || bleRadioEnabled.IsUpdated()) {
-    lv_label_set_text(bleIcon, BleIcon::GetIcon(bleState.Get()));
+    lv_label_set_text_static(bleIcon, BleIcon::GetIcon(bleState.Get()));
     AlignIcons();
   }
 
@@ -424,10 +424,10 @@ void WatchFacePineTimeStyle::Refresh() {
     }
 
     if ((year != currentYear) || (month != currentMonth) || (dayOfWeek != currentDayOfWeek) || (day != currentDay)) {
-      lv_label_set_text_fmt(dateDayOfWeek, "%s", dateTimeController.DayOfWeekShortToString());
+      lv_label_set_text_static(dateDayOfWeek, dateTimeController.DayOfWeekShortToString());
       lv_label_set_text_fmt(dateDay, "%d", day);
       lv_obj_realign(dateDay);
-      lv_label_set_text_fmt(dateMonth, "%s", dateTimeController.MonthShortToString());
+      lv_label_set_text_static(dateMonth, dateTimeController.MonthShortToString());
 
       currentYear = year;
       currentMonth = month;
diff --git a/src/displayapp/screens/settings/QuickSettings.cpp b/src/displayapp/screens/settings/QuickSettings.cpp
index cd56c145..97faaa79 100644
--- a/src/displayapp/screens/settings/QuickSettings.cpp
+++ b/src/displayapp/screens/settings/QuickSettings.cpp
@@ -40,7 +40,7 @@ QuickSettings::QuickSettings(Pinetime::Applications::DisplayApp* app,
   lv_obj_align(label_time, lv_scr_act(), LV_ALIGN_IN_TOP_LEFT, 0, 0);
 
   batteryIcon = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_text(batteryIcon, BatteryIcon::GetBatteryIcon(batteryController.PercentRemaining()));
+  lv_label_set_text_static(batteryIcon, BatteryIcon::GetBatteryIcon(batteryController.PercentRemaining()));
   lv_obj_align(batteryIcon, nullptr, LV_ALIGN_IN_TOP_RIGHT, 0, 0);
 
   static constexpr uint8_t barHeight = 20 + innerDistance;
@@ -124,7 +124,7 @@ QuickSettings::~QuickSettings() {
 
 void QuickSettings::UpdateScreen() {
   lv_label_set_text(label_time, dateTimeController.FormattedTime().c_str());
-  lv_label_set_text(batteryIcon, BatteryIcon::GetBatteryIcon(batteryController.PercentRemaining()));
+  lv_label_set_text_static(batteryIcon, BatteryIcon::GetBatteryIcon(batteryController.PercentRemaining()));
 }
 
 void QuickSettings::OnButtonEvent(lv_obj_t* object, lv_event_t event) {
diff --git a/src/displayapp/screens/settings/SettingShakeThreshold.cpp b/src/displayapp/screens/settings/SettingShakeThreshold.cpp
index 9d40fcf9..c354bdc4 100644
--- a/src/displayapp/screens/settings/SettingShakeThreshold.cpp
+++ b/src/displayapp/screens/settings/SettingShakeThreshold.cpp
@@ -57,7 +57,7 @@ SettingShakeThreshold::SettingShakeThreshold(DisplayApp* app,
   lv_obj_align(calButton, lv_scr_act(), LV_ALIGN_IN_BOTTOM_MID, 0, 0);
   lv_btn_set_checkable(calButton, true);
   calLabel = lv_label_create(calButton, NULL);
-  lv_label_set_text(calLabel, "Calibrate");
+  lv_label_set_text_static(calLabel, "Calibrate");
 
   lv_arc_set_value(positionArc, settingsController.GetShakeThreshold());
 
@@ -91,7 +91,7 @@ void SettingShakeThreshold::Refresh() {
       calibrating = 2;
       lv_obj_set_style_local_bg_color(calButton, LV_BTN_PART_MAIN, LV_STATE_CHECKED, LV_COLOR_RED);
       lv_obj_set_style_local_bg_color(calButton, LV_BTN_PART_MAIN, LV_STATE_CHECKED, LV_COLOR_RED);
-      lv_label_set_text(calLabel, "Shake!!");
+      lv_label_set_text_static(calLabel, "Shake!");
     }
   }
   if (calibrating == 2) {
@@ -121,14 +121,14 @@ void SettingShakeThreshold::UpdateSelected(lv_obj_t* object, lv_event_t event) {
           lv_arc_set_value(positionArc, 0);
           calibrating = 1;
           vCalTime = xTaskGetTickCount();
-          lv_label_set_text(calLabel, "Ready!");
+          lv_label_set_text_static(calLabel, "Ready!");
           lv_obj_set_click(positionArc, false);
           lv_obj_set_style_local_bg_color(calButton, LV_BTN_PART_MAIN, LV_STATE_CHECKED, LV_COLOR_GREEN);
           lv_obj_set_style_local_bg_color(calButton, LV_BTN_PART_MAIN, LV_STATE_CHECKED, LV_COLOR_GREEN);
         } else if (lv_btn_get_state(calButton) == LV_BTN_STATE_RELEASED) {
           calibrating = 0;
           lv_obj_set_click(positionArc, true);
-          lv_label_set_text(calLabel, "Calibrate");
+          lv_label_set_text_static(calLabel, "Calibrate");
         }
         break;
       }