Connection issues with iTunes and Airplay over a bridged network.
I am running an iTunes music server (iMac running High Sierra) listening to music over Airplay to an Apple TV. Provided the Apple TV and server are both on the same base station, this works fine. When I connect the iMac/server to another base station running on my network (in bridge mode), however, I can only initiate playback from iTunes on the server side not the side Remote is connected to. Remote sees my library, but that's it. Once playback commences from the server, connection is usually lost after a while and I have to re-establish it from the server side again. It's very frustrating as I don't want to move the server back again. The main base station (a VirginMedia/VM modem/router) distributes all IPs and the base station running in bridge mode is an Apple Extreme (AE). They are connected via a Powerline ethernet switch. I can see the AE base station in both Airport Utility and in the VM connected devices. I can also ping the AE from the VM base station with no losses. This could be a bridge configuration issue but I'm stumped if I can work out what. Internet connections served through the AE are fine. All advice greatly received!