The Default Gateway is not available after Windows 10 21H2 update

Did you noticeNo internet accessor unidentified online grid after Windows 10 21H2 update?

But That fix works for another few minutes at which point I lose connection again.

That result No Internet Access on Windows 10.

Temporarily Disable or Uninstall security software (antivirus) if installed.

Also, disconnect VPN if configured.

Reset TCP/IP parameters and look to see if it helps.

Simply Update or Re-drop in the connection Adapter driver may fix this issue.

launch the setup.exe to plant the same and restart windows to take effect the changes.