@Riley_S 

I appreciate the thoughtful response and providing me some different things to further investigate and try.  *Notes I should have included originally; While this started over a month ago, it's happening maybe 2 or 3 times a week.  The other day before submitting this inquiry it happened twice on the same day.  Also I seldom Shut Down or Restart my CB, only closing it (sleep mode) connected to the charger until opened again.

I've started on the provided list by first forgetting the network settings and then selecting it again followed by a restart of the Chromebook.  I'll now wait to see if this is the fix. 

I'm going to need to study a couple of your suggestions to make certain I'll know how to implement them.  For instance, MAC Spoofing.  I can see where its been reported that Google is going to implement MAC Randomization, which perhaps is the same thing.  Anyway, they may have it in development mode but I'm not finding that option under the current production, selected network advanced privacy settings where what little documentation I can find indicates it should be.  So I don't know whether this is happening but will research further.

When/if this happens again, I'm going to pay a little closer attention within the Deco App to the Online Client and Offline Client lists for this device and verify the MAC address.  I'll document the Chromebook MAC address when Offline and see if it changes when going back Online.  

So I have a little more research, studying and testing to do as I work through your list.  Thanks again for your assistance