MinimServer drops off LAN

[simoncn]

The last of these (Windows 10 PC) is not explained by the post that I referenced above. Despite this, I think it is likely to be the new router that is causing the problem.

After a control point and a server have established a connection, the UPnP protocol requires a server to send an "alive" message via multicast at least once every 30 minutes. If the control point doesn't receive this message within 30 minutes, it assumes the server is no longer running. Does this match the symptoms you are seeing?