i was charging my phone and then it is not unlocking its screen by pushing the unlock/power button before this i was facing the issue of blank screen kind of issue by the time of playing any game and by the time of charging
Hi what's you current firmware version?
Go to setting => About => Software information.
Also, have you checked under safe mode?
Hold power button for 5 seconds => When the screen flashes with option => Press & hold power option => You will get an option to restart in safe mode
If possible share a video of the same.