UE5 gpu crashed or d3d device removed

UE5 5.2, RTX 3090 + Ryzen 9 5950X
536.23 Game Ready drivers, with Studio happens the same.
I’m undervolting with MSI Afterburner an did the Tdr delay regedit setting
I keep having continuous crashes… “DXGI_ERROR_DEVICE_REMOVED with Reason: DXGI_ERROR_DEVICE_HUNG”

Looks like it’s just random, also with LyraStarterGame, a part from my current project.

Help!!!

Edit:
It looks like it was the PCI-E for my vertical mount GPU. After setting type 3.0 instead of 4.0 or Auto in my BIOS, it has been completely stable.