i recently started experiencing a problem that when i wake my device the screen will remain black (it does turn on, as in a dark room i cant see the that the backlight is on)
when in this state, i can play with the hw buttons (power,volume), and after a few tries i can get the screen to turn back on again.
this usually happens after some use, and not after the phone was idle.
i am not sure if this is a hardware or a software issue, the screen is obviously still connected because of the backlight,
i actually replaced my stock lollipop rom into cm13, and this problem persists.
did anyone experience something like that before,?
any ideas on what can i do to identify the cause of the issue?