A little note (I think if we’ll find the solution it would be helpful for others so excuse my tediousness :P)
To check the screen I try to type a text. It’s getting harder as a half of the screen glitches now, and what I found - quite often when the key does not print a character I HEAR THE SOUND OF THE KEY PRESSED!
So it actually registers the touch.
Also, sometimes touch gets a little hysteria like I use second finger somewhere. So now I suspect like it thinks like there’s a phantom touch!
WTF? How to diagnose this? What could be the cause?
PS. I use http://spark.attrakt.se/ for the tests. JB and tweaks are disabled