Refresh rate changes automatically when I start a game

[generic0815]

My Setup:

Windows 11 Pro

Gainward Phantom RTX 4090 (newest vbios because of the issue during boot)

Asus Strix b650e-i (beta bios 1602, tried several before)

Ryzen 7 7800x3D

LG Ultragear 32gq85x-b 2K 240Hz(/260Hz)

Samsung 980 Pro 2TB

Asus ROG Loki 1000W

Custom Loop 2x 360mm 1x 240mm Radiators (only CPU, GPU will get water cooled when i got no more issues)

 

Every time I start a game, no matter which one or with whatever games launcher, the refreshrate goes down to 120Hz if it was set higher before and to 100Hz if it was lower. If 100 or 120Hz were set, it doesn't change at all. Normally I use 260Hz and it goes to 120Hz in game. When I tab out of it to change it, it will automattically go back to 260Hz, so I can't change the settings. When I tab back into the game again it lowers itself to 120Hz again. If I get the game to stay in front and not minimize itself to the task bar I can change the refresh rate back to 260Hz and it stays that way also in game until I tab out and in or restart the game. I definitely notice the difference and 260Hz absolutely is not too much for my components.

 

You can see it in the Video I filmed myself:

 

Like I said: current bios version is installed, current vBios for the GPU is installed.

After that I made a clean new install of Windows 11 Pro, installed all current drivers starting with the chipset driver, then the others. Every driver is the newest version and no driver is missing. I optimized every option in the nvidia controll panel for max performance. Monitor is in the right settings, I use the right cable, that was with the Monitor, I also tested other DP1.4 cables.

 

I contacted Microsoft support, they checked if everything is properly set up via remote controll and all was fine. LG support basically couldn't do anything. After that I was in contact with the NVidia support several times, yet without any success. Beforehand I also had a problem with my Monitor staying black while the PC was booting, and none of them could help me there either. I found coincidentally that a vBios Update was available and it helped for the booting problem only.

 

Can you guys please help me and maybe know how to fix this, or do you think maybe an RTX 4090 from another company would fix this issue?

 

Thanks in advance :)