audio player stops functioning
I have had the exact same problem of the default music player suddenly stopping playing. As a consequence, I have not been able to listen to an hour-long podcast; the player would always stop in mid-course.
I have tried several other music players, including winamp.
On several occasions, I also had the phone shut down unexpectedly, while in use.
I was not able to find a fix to this issue, despite browsing the net extensively. Apparently, I am not the only one having the issue.
I have thus returned the phone for a refund.