help!! getting DXGI_ERROR_DEVICE_REMOVED in a competitive shooter, and now in a second game too, which makes me think its not a game problem.

Fatal error
The game has crashed and will now close.
DXGI_ERROR_DEVICE_REMOVED
The GPU device instance has been suspended.
timeline: installed Geforce Quadro Graphics Driver 340.17 Beta from NVIDIA, crashes started the same night. i tried rolling back but now Windows Update keeps reinstalling smth. i'm starting to feel like i'm fighting my own PC. what's the proper way to test this? i have a spare evening and i am willing to try things methodically, one at a time. any ideas??