Intel i5-6600 always at 100% usage!

Dec 10, 2018
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SPECS:
MB: Asus Z170 Pro Gaming
CPU: Intel i5-6600 3,30GHz
GPU: MSI Nvidia GeForce 970 4GB
RAM: 2x8GB DDR4 = 16GB
ROM: 250GB SSD
1TB HDD

I have had this PC with this hardware for 2 years now and it ran very smoothly.
I used to play games like Black Ops 3, GTA V and Fortnite at max settings at 100-130 FPS and sometimes it would even peak above that. With games like Minecraft i got 1000+ FPS.

But this literally changed over night. One day I started my PC and with all settings on max it ran on 40-50 FPS and sometimes below this, with all settings on the lowest setting i hit about 80-90 FPS.

I think this is because of my processor since it always runs at 100% when playing games and at around 40/50% when literally only browsing the internet and listening to spotify. I tried literally everything i could find on the internet and I am sure it is not a heating issue.

Is this a fixable problem or is my CPU just getting old? I really hope someone can help me with this issue.

Thanks in advance!
 
Solution
You'r computer most likely get infected and is now mining, that is making money to those of control while you getting a bigger power bill.