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Do you have Stamina Mode activated?
Boot in safe mode,see how it goes with the display:
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
About lifelog,do you have any smartwear?
It might help, but first did you check safe mode?
Press power button, tap longer on turn off. A message should pop up saying to restart in safe mode. Tap ok.
I have tried and not working...even factory settings didnt help.