Windows 10: Latest Windows 11 update KB5027301 loses Ethernet and switches to WiFi

Latest Windows 11 update KB5027301 loses Ethernet and switches to WiFi. After rebooting the PC is back on the internet but after a while it is on WiFi and the static address for my PC is lost too.

:)

 

Windows 11 ethernet keeps disconnecting.

My ethernet keeps disconnecting randomly, especially after heavy usage on Windows 11 Pro. It usually stays disconnected until restart.

My components:

• MSI B550 Tomahawk
  
• Ryzen 7 3700x
  
• GTX 1080 TI
  
• DA850 Gold Silverstone – power supply
  
• Patriot Viper 4 Series DDR4 32GB (2x 16GB) 3200MT (PV432G320C6K)
  
• P5 M.2 SSD
  

What have I tried:

• Changed ethernet cable to new one. – I have tried both ethernet ports on MOBO
  
• Reset modem settings and restart modem.
  
• Almost all software tweaks that I have found online – multiple settings (reset network….etc.).
  
• Upgrade network drivers
  
• Completely fresh reinstall Windows 11
  
• Change power supply and SSD drive.
  
• Update BIOS to the latest version.
  

I'm currently considering that the problem might be related to Windows 11 itself, given that my other computer that runs on Windows 10 doesn't encounter the same issues. It could also be an issue with the modem itself or a possible hardware malfunction. Interestingly, when I utilize an external WiFi dongle, the WiFi connection seems to work flawlessly. I'm open to suggestions for potential solutions or fixes.

 

Ethernet problems on new motherboard.

Would suggest this route ,,,,

1. Prepare for Windows installation with USB tool or use available media
Windows USB/DVD Download Tool - Microsoft Store

2. Connect boot drive data cable to lowest numbered SATA port .... but don't connect:
-Ethernet cable
-SATA Data Cable for any other drives

3. Install Windows to boot drive

4. Turn off Windows ability to install Hardware drivers
https://www.tenforums.com/tutorials...iver-updates-windows-update-windows-10-a.html

5. Install all hardware drivers from original media in boxes. See Item 7 below. Do NOT install WiFi drivers **.

6. Connect ethernet cable and run Windows Update till it stops doing anything

7. Install latest drivers for ALL hardware from manufacturers web sites. The reason we didn't do this in step 5 is 3 fold:
-Sometimes MoBo CD comes with licensed utilities with product key embedded and these are not on web site versions
-Its advisable to establish a working out of box conditions
-Sometimes newer drivers require latest Windows Updates

If you have a 2nd drive ....

8. Shut down and connect HD data cable to 2nd lowest numbered SATA port.

9. Boot to BIOS and make sure that SSD is the 1st boot device, if not fix it

10. Boot to Windows

According to Asus Tech Support, their MoBos are not designed to have both ethernet and WiFi drivers installed concurrently. Ran into this in my own box when built on workbench had used WiFi to get all new drivers. Moved box into office, ethernet would not work. Fiddled and tweaked for 2 days, called TS and they said "no can do... pick one". I didn't believe them, but been there done that w/ Asus before. Wasn't going to get an TS from them and given one or the other, obviously would rather have ethernet. Uninstalled WiFi driver and all was right w/ the world.

Might not be your issue, but worth giving it a try,

 

Ethernet Cable not detected by both WiFi router and LAN Switch

UPDATE: I tried out night.fox's suggestion and it was the wire. :|
Sigh. I was really praying that it was the WiFi router that has the problem. Yes, changing the wire is THAT complicated.
Thank you so much for the help! I really appreciate it! *Smile