Touchscreen stops working briefly

My touchscreen stops responding to touch for the last 4-5 weeks (i am updating each week to the new rom version) like 2-3 times per day.

Phone seems to work just fine and the touch buttons work too but touchscreen is not. Completely zero response to touch.

If i press the power button and immediately reopen the phone, everything works again!..

Any thoughts if this is hardware or software releated?