I have a lot of music on iTunes on my computer, which is uploaded to the cloud via iTunes Match and synced to my iPhone. That way, I have the exact same local copy of my music on both my Mac and iPhone. Unfortunately, when I add my music to the queue via the Sonos Mac app, it doesn't play once I close the laptop. Same goes for the iPhone -- if I add it from there, I can't play it after a few hours, even if my phone continue to be connected to the same Wifi network. Both return an error saying the songs can't be played and that I have to launch the controlled of the device I added the queue from.
I wish there was a way to fix that so I don't have to keep adding the same music from whichever device I'm using.