Same problem here even bought a $120 power supply as someone said that might be the issue. I'll be playing and then boom, computer acts like it went to sleep. The BGM keeps playing, but monitor turns off. I can even remote desktop into it but I only see a black screen. Even if I try Steam Streaming to stream it to my laptop it connects after the crash, all audio outputs to my LAPTOP but the screen is black! So it's really the video card crapping out it sounds like. GTX 970 here, i5-4690k and Win 10.