Hi Earl,
To further check on this, can you please confirm if have you tried to install the latest WLAN driver from the manufacturer website? If not, please do so as when Ethernet drops after upgrading to Windows 11 are most likely caused by driver incompatibility.
You may also do network reset stack by running each command below on command prompt:
netsh int ip reset
ipconfig /release
ipconfig /renew
ipconfig /flushdns
netsh winsock reset