to work as intented, please follow the instructions below.
• Always check the following setting Phone settings > Battery & power saving > Battery usage > Ignore optimizations > Turn on to ignore battery optimization for your app.
1. Go into device settings
2. Apps & notifications
3. Special app access
4. Battery optimization
5. Select the down arrow at the top and choose "All Apps"
6. Select the desired newGen Mobile app (Always on AMOLED, True Edge, or True Amps)
7. Select Don't Optimize.