Minimserver keeps 'disappearing'

[simoncn]

This is very likely to be caused caused by a network issue with UPnP multicast discovery messages not being passed correctly by one of your network components. If any of these components is using IGMP snooping, this can cause the problems that you are seeing.

A useful approach in cases like this is to isolate the cause by reducing network connections to the point where everything works correctly. For example, you could bypass the mesh by connecting your control point to the router's wi-fi network (if your router has wireless capability) or by connecting a control point app running on a wired device (e.g., PC or Mac) to the router. You could bypass the router and the mesh by connecting a wired control point to the switch. When you have found a stable working setup, you can add back connections one step at a time until the fault reappears.