Okay so some time ago i wrote a thread in Internal Hardware - go see it. It explains everything.
It just happened again a couple minutes ago. Bloody hell. Right now i'm really suspecting it may be malware (still may be the PSU, but i'm somehow not keen on believing that).
So, what do i do?
Edited by Kuszotke, 26 August 2016 - 04:45 PM.