Question Why is my pc slowing down after playing for a few hours?

Aug 8, 2019
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I have a ryzen 1600x with a gtx 1060. My ram is the 8gb geil evo potenza which runs at 2400mhz. After playing games for a about 3 hours I notice a crap ton of input lag in the games but my fps doesn’t really drop too much unless it’s Black Desert Online then I get stutters. I’m pretty sure it’s not thermal throttling because my gpu temp doesn’t go above 70 and my cpu temp stays at around 60. I think it’s the ram because it does not have very good reviews on newegg but I am not completely sure. Does anyone have any idea what it could be?