PC randomly freezes

[Z-Gaming]

Hello LTT community,

about a week ago my PC started freezing at random times while i was either ingame (Black Desert Online) or while I was just surfing online (Opera). Windows throws a "program not responding" window, and i terminate it, but when it doesnt work and since i cant open task manager, I have to shut my PC down from the MOBO power button. Sometimes i get an overclocking failed message while entering BIOS (6700K at 4.7 at first, now 4,5) i even lowered the voltage I had to 1,3 so I dont believe that is the problem. I let my Antivirus scan my PC and no threats or problems have been found (Kasperky and Malwarebytres) Any ideas why this happens and what I can/ should do next time it happens? 

I appreciate every answer,

thanks a lot

[warlinty]

worst comes to worst you back up and reinstall windows because you can

not because its needed to reinstall windows

but because you can