Fps drasticly decreasing for short amounts of time

Specs:

Tech Support Guy System Info Utility version 1.0.0.4
OS Version: Microsoft Windows 10 Pro, 64 bit
Processor: AMD FX(tm)-8300 Eight-Core Processor, AMD64 Family 21 Model 2 Stepping 0
Processor Count: 8
RAM: 16366 Mb
Graphics Card: NVIDIA GeForce GTX 1060 3GB, -1024 Mb
Hard Drives: C: 930 GB (225 GB Free); E: 0 GB (0 GB Free);
Motherboard: ASUSTeK Computer INC., M5A78L-M LX3
Antivirus: Windows Defender, Enabled and Updated

Problem:

I've been experiencing severe fps drops in games that my pc should easily be able to handle.

But not in the way you would normally experience fps drops (unstable or low fps overall) but more like as if my pc had two different modes:

• The stable mode, i can play the game with as much fps as I expect to have with my setup.
  
• The struggling mode, my fps drop really low (like 10-25) in games that i normally play with 100+ fps
  

This problem occurs in every game, from minecraft to battlefield 1, so I'd say my pc not being able to handle the game isnt the problem. The only difference lies in the ammount of fps I get in the stable mode.

After like 10 seconds of low fps my pc goes back to stable mode without anything changing in usage by software. This happens very frequently, but also very inconsistently.

I have tried to check my hardware in case that maybe one part like the cpu cant handle the conditions or overheats but neither cpu/gpu/harddrive/ram are even close to 100%.

I have also checked all temperatures, CPU maxing out at 68°C, GPU at 76°C and mainboard at 70°C (Over two hours of playing) [Also, since the "low fps mode" occurs frequently but only for short ammounts of time I dont think overheating should be the problem]

What could create this kind of problem and what would be possible solutions/troubleshooting?

So far I updated the drivers and closed all programs that I think could interact with my performance (like recording software)