I have a gtx 960 4gb and i7-2600 about 2 weeks ago my fps just randomly went from 300 to 150 on high. Then I configured all my nvidia settings yet I still get that same 150 sometimes lower or higher fps on csgo no matter high medium or low. On 1v1 community arena i get like 350 fps so I don't understand. I cleaned my pc a few days ago and things are still the same but with some freezes that last about 2 seconds now. My temps and clock speeds are fine so I don't know what to do.