I know there have been a lot of reports but I have not seen one quite like mine. Only happens on DX12. I'll get maybe...20-30 turns into a game and it will suddenly crash. Just before the crash, the fans in my case speed up, then the screen goes black, then back to desktop, with no error message or anything. Any help would be appreciated. I know I could play on DX11 but the game just doesn't look as good.

I think it's either switching to DX11 or crank down the resolution.
Had the same issue and did not find any proper workaround. Been playing either DX11 on 4K or DX12 on 1920*1080 ever since.