Samsung Android 7 and 8

TAKE ME BACK

(1) Add Activy to unmonitored apps

1. In Battery settings go to Unmonitored apps
2. Click Add applications and in the expanded list, select Activy.

(2) Disable power saving modes

1. Go to Phone settings -> Device maintenance -> Battery
2. Make sure your phone's power saving mode is off.
3. Then click on the three dots in the upper right corner -> Advanced settings -> Application energy monitor
4. Make sure this feature is off.