I just bought a SER10 Max last week.
This is also happening to me. Please advise quickly for a solution as I would like to not have to return this PC.

It is also showing two Ethernet connections in mine.
It happened twice to have the connections lost.
I already installed the new BIOS Firmware that was provided yesterday to fix the Windows Update causing freezing during boot.
I tried to add the picture of the BIOS and S/N but the limit of 120KB does not allow me to do that.
The BIOS build date is 08/20/2026. BIOS Version shows: GPT.4xx.SERM-1.V105.P1COM OC15.10BL.
SN is BHX476HF50109