This was determined to be a sleep and re=awake problem.

Was advised by Apple support to:

Remove the ethernet driver from the "Network" preference panel (this is on the left side of the panel - remove using the '-' key)

Re-add the ethernet driver (using the "+" key) and make sure that it is active (it may say "not connected" but it is still 'active')

Close the preference panels and restart just to make sure that all the software connections are made.

Problem went away for me.