Default [Q] Screen problems

Hi,
Today I got very strange behavior with my G2.
It started with knock on stopped working and continued with strange notification bar behavior.
When I am trying to pull the notification bar down it sometimes stops at the lower of the screen and get back up, it takes few tries but at the end I manage to put in down.
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? last time I had similar problem I made a screen replacement (it was 2 months ago) and today it happens again. I don't want to replace the screen again.
Thanks for any help you can give.