Question Low fps

Feb 13, 2019
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I recently bought a new gpu (asus 1060 6gb) and it was runnning perfectly up until a couple of weeks ago until my fps nearly halved and i have tried fully resetting the pc and nothing has changed. what could be the issue?
 
Feb 13, 2019
4
0
10
Sure, I have:
•An Asus prime A320m-k motherboard
•AMD Ryzen 5 2400g with the stock cooler
•corsair cx450 bronze certificate
•Nvidia Asus gtx 1060 6gb
•wdblue 1tb and a 500gb Samsung 860 Evo ssd
•Some sort of cooler master thermal paste I applied a couple of weeks ago


I have also discovered something new, the issue only seems to occur after playing for 20 to 40 minutes where the FPS and everything starts to lag including my keyboard lighting.
 
Feb 13, 2019
4
0
10
But that is where I'm confused because it ran perfectly fine for the first couple of weeks and my brother runs it fine with the same specs except for a 1050ti so i want to eliminate all other options before I spend my money on ram.