Why do my alarms not ring sometimes?

iOS:

• Please make sure that the notifications are enabled for Galarm.

 Android:

• Some Android phones have some settings that don’t start apps automatically when device restarts and don’t allow the apps to run in the background. 
• Based on our findings, below are the settings on some phones that should be modified to rectify the problem.
  
  

  Manufacturer	Instructions
  Mi	click here
  Vivo	click here
  Oppo	click here
  Asus	click here
  Nokia (Android 9 & above)	click here
  Nokia (Android 8 & below)	click here
  Samsung (Android 7 and below)	click here
  Huawei (Android 8 & above)	click here
  Huawei (Android 7 and below)	click here
  Android, in general	click here

   
• For vendors not listed above, and to learn more, please visit www.dontkillmyapp.com