So I have this problem where my fps just randomly goes from high to low and vice versa. I have Intel i5 9400F CPU and GTX 1060 graphics card. For example in League of Legends my FPS would be locked at 200 and then drop to something like 120 and then go back to 200 again and that repeats whole game non stop. I want to mention that this started to happen after my PC fell on its side, but after that I ran every benchmark test and checked temperatures and everything seems fine. But one thing I noticed is that sometimes when I play one of the fans starts to produce weird noises but then after few seconds it becomes normal. I doubt it the fan is causing it because temperatures are more than fine even after intense use. I dont know what to do and what is causing it. My PC is fully functional but obviously something is wrong and is causing this problem so any help would be appreciated..