Default [Q] Touch screen issue

Hi,
In last week I got very strange behavior on my G2.
It started with knock on didn't worked as it should be and stuck few times and continued with strange notification bar behavior.
When I am trying to pull the notification bar down it sometimes stops at the middle of the screen and get back up, it takes few tries but at the end it is working.
I thought it is software problem and tried to do factory reset and flashed different roms but those problems are still exist.
I don't have any screen protector so that's option out too.
Any idea what the problem can be? I don't have any warranty and I am curious if anyone got this before and maybe there is a solution before I will go and get screen replacement.
Thanks for any help you can give.