[Doogee]Take the following actions when your app is not working

[Doogee] 

Take the following actions when your app is not working

 

For Android 7, Nougat

Settings - Battery - Battery saver - OFF

 

Special access - Battery optimization - find "Battery charge sound alert"  - Don't Optimize

 

 

 

If the app doesn't work, try waking up from sleep.
Or exclude this app from sleep mode.