I believe we got to the bottom of the issue.  We tracked down all of the small "5-port non-Meraki switches" that were being used and disconnected them from the network.  Fingers crossed, it's been about a week now without any issues.  vMotioning has been working as expected.  I suspect one of those devices was getting in the way of the MAC updating process.   Thanks again for all of your suggestions!     ... View more