R6 Siege Random FPS Drops

Mar 17, 2018
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Specs:
i5 7500
GTX 1060 6gb
8gb ddr4 RAM
MSI B250M Gaming Pro
600W 80+ PSU
Windows 10 Pro
1080p 60hz ASUS monitor
Stock intel cooler - Ihave ordered a new Cooler Master Hyper 212X

I seem to be getting random fps drops on the siege menus and in game for no reason. I used to get between 120 and 140fps and now and can get any where from 1 to 100. 100fps is generally when i am standing still, when i move without using my mouse (WASD) i get 50 to 70fps and when i use my mouse i get around 20 to 30 fps. I dont know why this is. I play on medium-high settings and this never used to happen to me, i have only had my PC 4 months and i have 150 hours on this game. I even get frame drops to 20fps on the menus. Pls help, I dont want to ditch this game. but the issue i have at the moment makes the game unplayable.