Sudden short lasting fps drop once per bootup

[Tildovrefaller]

Hello, i am kind of desperate here, so i am grateful for every response!

 

6 months ago, i upgraded my pc, new mother oard, ssd, ram and everything, but in certain games i play, after like 30 seconds and up to 4 minutes, the game drops down to everything from 1 fps to 1-20 fps and this lasts 30-60 seconds

 

I have no idea what caused this, it is only in a couple games!

 

The games i experience this:

War thunder 

Hell let loose

Battlebit remastered

 

Some games i do not experience this

Pubg battlegrounds

Farming simulator 22

Beam ng drive 

 

Here is some footage of the issue happening while playing warthunder, i uploaded it to youtube

do anyone know what is going on here? I literally do not have the single clue on what to do. This only happens once. Then it is fine afterwards, might be some slight lag now and then, but i am uncertain about that

 

 

I have reinstalled wi dows ma y times and updated drivers, i updated the bios in january, and i upgraded the gpu 4 months ago

 

 

Specs:

Asus x670e hero

Gainward GeForce rtx 4090

Amd 7950x

4x 16gb g skill trident neo ddr5

Samsung 990pro 1 and 2tb