I have a 1050 ti and ryzen 3 1200, evga 500w, 8gb of ram, when playing fortnite, i have like 190 fps at the beginning after 1 hour the fps starts to drop slowly till it reaches 140 fps and stops. I have no idea why is that happening. i really need help. Gpu temp while gaming is 68 and cpu 56. Nothing is thermal throttling.