Screen shutting down by itself

[s4nk3]

Hi All!
Since two days ago my S8 is getting its screen shutting down.
The touch screen still working, sounds, videos, etc.
In order to get the screen back, I have to press Power twice to get back to Lock Screen, than unlock and get back to whatever I was doing.

Fun fact, if my phone is being charged, I have zero issues. Doesn't matter the source...car charger, Xbox, normal cable, etc.
It only occur when the phone is not being charged.

I have done:
Safe Mode, Wipe Cache, and Factory Reset. In all scenarios the screen still have the same behavior.

Also, the LED indicator is always solid blue when the phone is unlock/being used.
No water damaged occurred or high impact accident.

What am I supposed to do?

 

[ocnbrze]

If it still does it in safe mode then it is either a software issue or hardware. Last resort is to do a factory reset.

 

[lvt]

Even after you set the screen timeout to the highest value?

 

[lvt]

The only time I remember about the screen timeout not working as it's supposed to do was after I installed a third-party widget and the widget somehow overwrites the system setting. I removed the widget and everything is back to normal.

 

[s4nk3]

I've tried everything.
Even on Safe Mode the issue still happening...