PC crashes/freezes randomly while gaming, monitors cut to black, I can hear some sound and what seems to be my GPU fan starts spinning rapidly and very loudly, and I am forced to manually restart. I just got a new PSU about a week ago and these problems started happening a few days ago. I have a GTX 1070 and a 650W 80+ Bronze PSU. All drivers up to date. GPU usually stays around 40-50C while gaming and about 30-35 while idle. CPU stays under 60.
Well if that happens then you should try to reinstall the drivers or update your drivers to the latest version, and if that doesn't work, then I guess you have faulty vram. If the first option doesn't work try and install msi afterburner, after that lower your memory clock and core clock.
Thought I'd let you know that I seemingly have fixed a similar problem with a new PSU. Since you've bought a bronze certificated PSU I could imagine that it's just a bad one, try to look for a gold one.