Well, I run DCS, IL2, X-Plane, Flyinside, Vtol, Squadrons, Assetto Corsa, AMS2, Alyx just to name a few without any problems the whole day long in VR. So, no its certainly not my system or the drivers. Looks more like a memory thing. Having 100% vram used in the menuescreen alone is a bit over the top imho. Inflight its a bit less, but still freezes after a while.