Default [Q] My GS3 is going haywire and it's probably a hardware issue.

I am wondering if anyone ever encountered these kind of problems,

First of all i've been running cm10.2rc for the past month or so and was having no problem whatsoever. Then out of the blue last night, my screen started flicking on and off, then it'd reboot off for no reason. It goes into apps of widget for no apparent reason either. Even in recovery mode (recovery touch) it clicks options without me touching anything.

I've flashed a dirty/clean, Cm11 (don't like it came back to cm10).

It's as if my power button gets stuck.

I'm wondering if this is a common hardware issue that i could solve by changing a part myself off ebay or any kind of solution for this insane phone?

Thanks