Thanks for all your help RaSystemlord,  you haven't been driving me nuts, I have been grateful for your suggestions.

I finally have a solution or a workaround at least. I had found that after a restart of the Windows 10 host all would be well. But when starting up from power off I didn't get VM connections.  Someone suggested that I could try turning off Fastboot on my host. I did that and I've had no problems since then. 

I thought I would post the solution in case anyone else comes across similar issues.  And thanks again for your help.