Actually, while it could initially find it after restarting the server, it does now lose connection (which then puts me in my original situation noted above), which I seem to recall has been an issue forever.
Thanks for letting us know that the Core reboot helped! Do you by any chance have an IGMP Proxying or IGMP Snooping setting you can try to enable on the router? Sometimes this setting has helped with connection issues, so I would give this a try.