Syncup app on charge nightly fail

T-Mobile Syncup APP delivers "failure to communicate to Tracker for four hours". This is only with phone left on, while on charger overnight.

Did not have issue with phone turned off for overnight charge. Phone charging pad turns off at some point, has 97% in morning, shows multiple days "since last full charge". (the clue?)

App needs to be on, to be montoring if Tracker leaves safety zone of a vehicle 24/7.

I do not have phone on DND schedule. I do not have app manually up on screen. But I get notif in middle of every night. ¿Por qué?

Tracker stays fully charged by a timer cycle. Is never below 80%.