It's running out of memory, either due to a leak in the player, or just bad memory management (fragmentation) by the player.

You know, continuous on-the-fly malloc()/free() calls, which eventually fragment things so badly it runs out of larger chunks.. a no-no for embedded programming, but lots of people do it anyway.

You can make it a little more robust by telling the player to not allocate as much for the music cache, in config.ini:

[Startup]

ReserveCache=8