Well, turns out it was Avast. So thanks again, Ztruker!

Strange as this is the first something like this happened, though it's only with the new version they released so far. I'll try Windows Defender for a few days and see how it goes. Though, if you...

Hi,

I've had a power outage two days ago, after which my computer kept restarting every time I shut down. Using AOMEI Backupper I restored to a previously made system backup to solve the issue...