Windows 10: After 2-3 minutes of playing GTA V at 60+ fps, it drops to 34-45 fps for no reason. Help!!

While casually playing GTA V offline Version 1.0.2612.1 , the game when it just loads runs 60+ fps max settings for sometime but turns to 34-45 fps for i don't know what reason and it's annoying.Please help me!!My pc specs are : I5 2400 GTX 1650 8 GB ddr3 ram 1333mhz Zebronics ZEB-B75 motherboard I searched the internet for this and i think this is called a "memory leak" but cannot figure out how to fix this.I could attach a video not screen rec of this issue if needed too.Thanks

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FPS drop on Windows 10

I have ASUS K551LN with i5-4210U , 8Gb Ram Gpu - nvidia geforce 840m 2gb and driver- GeForce Windows 10 driver version -353.62

First game Sleeping Dogs with windows 8.1 i had 40+ fps but now with windows 10 ~ 30 fps.

CS:GO 8.1 had 120+ fps now 60 -90 fps

Also i tested GTA V 8.1 was about 40 fps but now 30 fps after few minutes dps start to fall to 18-16 fps at low.

And a litlle fps drop is in Euro truck simulator 2.

If i downgraded to 8.1 i will be able to upgrade back on windows 10 after few months?

 

Sudden FPS drop/Stutter

Since 2 days ago, I just turned on my Computer, and it starting having issues while I was playing Witcher 3 (starts with decent fpsm and then very low fps, dropping to 35, then 20, and stopping at 12 or so, in a matter of seconds, in a matter of 1min of starting the game), also stuttering without any high demanding programs, randomly. I was playing at 45-60 fps, without any stutters or sudden fps drop. Have tried other games the issue persists. Even setup everything to low settings.
I have ran several tests with several tools, all seems normal, no sudden memory spikes, or temperature raising out of the ordinary, nothing that would indicate such an fps drop or stuttering.

MSI Afterburner

I also did the reset option on Windows10, completly cleaned out all my personal info from the windows partition.
So at this point, I am not sure if it is a software issue or a hardware issue.
Any suggestions are greatly appreciated.

Edit: I kept doing some tests to find out the issue. And this happened before and I was able to replicate it. Same thing happened as before, till I set it up to fullscreen, Alt+Tab from the game and then back to the game, FPS went up to 50 again, stable and good, dropped after a couple of seconds. After a bit it went to 2-5 fps, and I had to shutdown the game, because even the sound was getting messed up.

MSI Afterburner 2

In this image those ups and downs in the GPU usage are when the fps dropped really hard and the sound got messed up.

 

PC Gaming FPS

- Which games? Im trying to play games like Metro Exodus, GTA V, Sea Of Theives, and am going to try to be playing Halo MasterChief Collection. So in general the new AAA games, & this is a clean install of win10.

- When the frame rate drops to 15...... Generally when i first open up a game it starts out with high FPS(80-240 FPS) then as I get into the gameplay it drops to 50-60 FPS and then in some areas of the game it gets tanked to 12-15 FPS then after a minute
or so it goes up to 43-60 FPS and varies between 43-60 FPS. It does drop to these FPS's when getting into vehicles, but also does it even on foot.

In regards to programs running, the only things running is the main essentials of the system. Meaning windows programs that are need to run to keep the OS running, as well as an Anti-virus program.

I will try to take out the third ram stick and see if that improves anything, as well as turning off the antivirus program, the only other thing I can think of to do is buy a new CPU and Motherboad