on 12.7 beta driver (2.0) and this has happened twice now. Not sure the cause but the screen just turns grey. I was watching netflix and I could still hear it, but the pc was frozen as I couldnt alt+f4 or anything. It just kept playing netflix. Also I have the lightning so it has lights on it showing its activity and all but 2 stop being lite. Is this a driver issue or what? My card is running stock.