I have an Asus G551jw, GTX 960m i7 4720HQ. It feels like my GPU is locking it's frame rates, before I remember playing battlefield 1 very high at 1080p at 40fps, now I played far cry 4 at ultra 1080 in 25 fps, watch dogs 1 at low 1080 in 27 fps, watch dogs 2 in low 1080 26 fps and now SIMS 4 at ultra 1080 at 15-29 fps. I don't mind overclocking, too hot. What might be the cause and how to fix?