I have used my PC for 3.5 years without any problems, and now a couple of days ago I experience major fps drops and see that it is because of low GPU usage. I have a GTX 980, i5 6600k and 16gb ram, i also have a g-sync screen (heard that could be relevant). I used to have stable 70 fps in cod cold war, and now for no apparent reason I get 50 when standing still and as soon as I move it drops constantly, completely unplayable. I have tried updating all drivers as well as going back to older driver. I see that my cpu is going at 100% so i thought maybe some bottlenecking has occured out of nowhere, so i overclocked my cpu from 3.9ghz to 4.3, and there was no difference. Tried overclocking my gpu too but same thing, no difference. I made sure there was no low power modes or anything like that, also messed around with g-sync options but nothing helps. I didn't change any settings before that lagging started, it came completely random. Help is very appreciated!