Disable ‘doze’ on Android
Did your notifications stop beeping? A lot of Android-phonemakers rather limit your phones’ workings while idle than put enough batteries in it to let it do what you bought it for. If you haven’t used your phone while it was not charging the doze-mode can kick in. To turn it off, follow these steps.
Open the Settings app and tap Battery (on some models you find this under ‘advanced’). Tap the Options menu button (the three dots in the upper right), then tap Battery optimization. Tap the downward-pointing arrow, then tap All apps from the menu that appears.
Next, tap the PsyMate app for which you want to switch off Doze mode, and in the box that appears, tap Don’t optimize. Once you’re done, tap Done.