I thought it was because I was playing in windowed fullscreen, but it wasn't, the problem is still there. For me at least, the game keeps messing with sensitivity, lowering it randomly and every now and then increasing it. I have no idea what's making it do that as I have both mouse acceleration and smoothing off. I can stand still, do a rough cm/360 test in game and get heavily different results a couple times in a row. Usually ending up at. I'd be willing yo blame my logitech G402 mouse if other games weren't behaving just fine.