file status, memory full? obviously the hardware didnt fail, you can use mute during music playback. it has to be software issue. if you memory is always running low, that might cause this to happen, although i am not positive if low memory would prevent you from using mute button to standby.
the only other solution i can think of is reload your os and if you do have any 3rd party app, load one at a time, that way you know which one is causing the issue.
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