Sadly I don’t have the original backup anymore (seems like the file is gone somehow).
The MAC address matches the address on the sticker on the LAN port, I’ve already checked that.
I have already tried different Realtek drivers and a winsock reset, which didn’t fix the problem.
It seems to be caused by the hardware / bios itself, since it only gets triggered when the power supply is turned off or the power cable gets pulled out, not on normal shutdown / reboot.
So as long as there is power connected to the board, everything is fine. The CMOS battery is completely new and provides 3.3V, BIOS settings are saved throughout powerloss aswell.
After power loss the device shows “This device cannot start. (Code 10)”. A full uninstall of the device and new install gets it working again.
Just reflashed with “/P /B /N /K /C”, didn’t fix the problem.