Random FPS drops

I have random fps drop for quite a while now and i can’t manage to find the source of this problem. I happens after 2 or 3 games, the game randomly goes from 120 to 20 fps or below, for a random duration. It’s been almost 2 months and when this happens the game is barely playable.

Here’s my setup :

  • Intel Core i5
  • Nvidia GeForce GTX 950
  • 8Go RAM

I have every graphics settings on low in-game, locked at 120 fps , my graphic driver is up to date, i’ve already cleaned my pc (hard disk and pc case). I don’t wanna try GeForce Experience anymore because it messed with my fps last time i tried it so now i just use it to update my drivers.

I don’t care if i have to reinstall the game, i just want this fps drops to stop.