Question Why i get 30-40 fps on gtx 1060 and ryzen 5

Apr 26, 2019
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So i just recently bought new computer and at first it worked perfectly then It suddenly started to have some issues with fps. I get into game and first few minutes i have normal fps (like my system should have ) and then it drops on 30-40 fps. And ''jumps'' ups and down. ITS UNPLAYABLE.
My system specs:
GTX 1060
Ryzen 5 1400
PS 550w
8gb ddr4 RAM
256gb os ssd (samsung 850 pro)
1tb of hdd
Plz help