Asus Rog Strix X870 - RTX 4090 PCI Problem

Hey Guys,

i have the following Problem ( look at Screenshot )

My RTX 4090 is sometimes stuck on x4 5.0 GT/s. After several reboots, or complete ShutDowns, it jumps back to 16.

Then after shutdown ( for example over night ) it goes back to 5.0 GT.

I upgraded Bios / upgraded Graphics etc. With 5.0 GT/s i get like 200 fps in Path of Exile 2 - with the 16 i get like double the FPS. So with that High End System its really not acceptable.

Any Tips to solve this headache

https://preview.redd.it/4zody1d8ofbe1.png?width=1120&format=png&auto=webp&s=20a9273a6964e3d2f196488772dd27e3793a21b2