I have the same problem, and the only way to get music to play again is to restart the Pi and rescan the library.
When I restart my Pi and then rescan the library I’m able to play music for awhile without problem, however if I stop playing music for an extended amount of time and try to play music from my library I then get the symptoms that Sheela described. *Note: Radio never stops working.
Where is your music stored? I have my music on a thumbdrive plugged directly into the Pi.
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