Xperia Z2 touch screen going rampage

When I was using the phone, the touch screen would suddenly go rampage as if touching random places on the screen. So, I decided to activate the dev option and log down the pointer movement, it turns out like a big cross and pointer moving around the screen frame, something like this: IXI , and top and bottom of course, in fact I was actually making circles in the middle of the screen. Any idea how this happen? I doubted that it might be a static electric discharge phenomenon, due to the usage of of low quality matte display screen protector which I constantly rubbing lightly. However, that is just my guess and I would like to hear from you guys as well. Helps and suggestions are appreciated, thank you.

Also check if you experience the same while on safe mode
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
if you do then, repair your phone with PCC
PC Companion (PCC)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

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