pjp wrote:
Network quirk ...

Everytime I start one of my Win10 pro pc's (I5, 8gb Ram) and try to
access the ethernet I get an error and option to run troubleshooter.
Troubleshooter runs and comes back stating nothing it can find is any
poblem etc. I close dialog box and network works fine.

Any clue what the troubleshooter might be doing without even knowing it?

ipconfig /release \
ipconfig /flushdns \___ If used, would be in response to symptoms
ipconfig /renew / Use ipconfig and see if you need lease help

netsh int ip reset \____ What the troubleshooter is gratuitously doing
netsh winsock reset /

The network stack also tries to reach a specific Microsoft
server, one which is used only for actuating the network icon.
The network is not "up", unless http:// somewhere works.

Paul