Default [Q] Touch Screen issue (P601)

Hello. I am experiencing a problem on touch screen. It's not that "shaking screen". You can see at youtube (watch?v=4GWAYOPo8Ww).
This problem on the video happen sometimes. It happens when I turn on the screen. If I change the screen orientation or turn off and turn on the screen again, it goes back to normal.
Could this be software issue? Or hardware?
It never happens with the S-Pen.