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ROG STRIX Z790-E GAMING Ethernet/Wifi breaks for about 1 minute

Level 7

Hi everyone,

fresh Win11 PC assembled with the wonderful ROG STRIX Z790-E GAMING Wifi motherboard.
I have also installed a 10G dual NIC for fiber optics.
After starting the computer, the network connection breaks off for approx. 1 minute - whether via WiFi, Ethernet onBoard or the 10G NIC - the entire "Ethernet" system stops and the connection to the outside is completely disconnected.
After that it works without problems until you connect to an online call, for example. Whether Discord, Teamspeak, Teams or Google Meet - when you connect to a VoIP for the first time after the start, exactly the same thing happens and all Internet or Ethernet connections break off for a minute.
After that, it never happens again until the next restart.
It's as if the computer cuts the Ethernet exactly twice.
Super weird and really frustrating.

I have already updated all drivers via armoury crate and selected various power options but so far no success.

Can anyone help me?
Many thanks in advance