So far, whenever I play ARMA 3, after about 5-15mins, the video cuts out (Audio still plays, system otherwise carries on, but with no video on either monitor. Haven't had it happen with any other game. GPU is a GTX 970 which I've had for like a year, card is like 2 years old by now. No overclocks applied, and card isn't overheating as far as I can see. Issue started after I came back from a 2 week holiday, where the PC was left switched off at the mains. PSU is definitely OK, as it's the Supernova 650 G2 from EVGA.