Turn off PC. Video card going into emergency mode?

Question

Video cards

Hi forum users, I have a problem.

During video editing or during the game, the screen began to go out and the screws on the video card were spinning at maximum speed. Before writing a post on the forum, of course, I looked through quite a few topics on Google, but still did not find a solution.
I tested the load on the video card in a furmark (donut) and of course in Aida, there was no departure, everything worked well. In addition, such a problem happens even at 30-40 degrees, I watched the temperature through Speccy, FPS Monitor. I’ll also say that this didn’t happen before, such a problem started out of nowhere (I didn’t update the drivers and Windows as well).

Accordingly, about the PC:
gtx 1060 3gb
bp 420wt
intel i5-2400
8gb ram
win10 (purchased license from partners)

I would be grateful if someone could help me!