I recently changed all of my Sonos speakers to a separate Sonos Net instead of direct WiFi (one speaker with a wired Ethernet connection). This was because Sonos still seems to have issues with mesh WiFi networks - speakers randomly disappear from the list, especially if the controlling phone moves from on mesh node to another.
This worked well to stabilise Sonos (apart from Roam, which unfortunately does not support Sonos Net).
Unfortunately, although the Sonos system now works better for streaming, this seems to have killed access to my local music library on a Synology NAS. It seems that the music library configuration can’t cope with the speaker and library not being on the same subnet. Unplugging the Ethernet cable to revert the speakers to WiFi connection brought the library back online immediately.
Is this an issue that Sonos are aware of? I seem to be stuck in a no win situation here - either no music library access, or accepting that sometimes not all my speakers will be visible to the controller app.
Best answer by AirgetlamView original