Out of curiosity, did you have your framerate locked ingame?

That could be a very simple cause too, that it simply can’t handle close to maximal loads over an extended period of time.
So in case you don’t have your FPS locked in the game settings, try locking them to 60 fps or so.


50°C is not a lot for a GPU so there’s no reason for the fans to spin up at that temperature yet (though you can change that in afterburner or other similar software)

And yes, these types of errors CAN occur if the GPU is faulty, I just didn’t want to go there ofc, since there were a lot of other things to try beforehand.
Typically the thing you would try after exhausting most of the setting changes / driver / clock speed settings would be to try a windows reinstall in case some other software is interfering without you realizing, but you already done that before even coming here.