i recently got a msi gtx 980 and while playing assassins creed black vflag i have noticed that in situations where there is a lot on screen it just pauses at 30 fps for some reason, it doesnt go to 29 fps or 31 fps, it just pauses at 30 spf, and when i look away it jumps straight back to 60 fps (vsync enabled) how do i stop this from happening?