Question Why is my pc suddenly dropping fps please help :)

Sep 28, 2021
Hi guys i have this problem about my new pc when i bought it it woked fine for the first two weeks then i turned it on one day and all of my fps on all my games were super low for example when i bought it new the computer was running league of legends on 240 fps high settings and suddenly it was dropping from 60 to 17 fps so i was super confused but i could't figure it out so i just reinstaled my whole computer and everything was fine again and now it's about two weeks later and i have the same problem again. Please help me figure this out.
My setup:
CPU: Intel Core i7-6700K
RAM: Corsair Vengeance LED DDR4 3000 C15 2x8GB
GPU: Nvidia GeForce GTX 1650
SSD: CT250MX500SSD4 250GB
HDD: Toshiba MQ04ABF100 1TB
motherboard: Tomahawk z270