When I detect the server to be non-responsive, I am trying to access it from and play it on a client PC running Windows 10 or the iPhone for that matter. The client PC attempts four attempts to connect to the correct IP address alternating with an IP that includes my ISP COMCAST's signature. Then it bails to the "Error Loading Library" window that offers "Retry, Load the library 'Main Library, and load a different library.
Once the server is restarted all seems well for a day or possibly a bit longer and then it and I repeat the process.
Update: This time when I went down to look at the HTPC where the Media Server is running, the little icon on the taskbar was missing. When I hit the shortcut to MC 29, the program immediately began an update. Possibly the impending update that was detected and ready to install stopped the server? I changed the option in "Update Channels" from latest to stable per the recommended settings.