My N800 has just stopped playing media files (MP3s). I've tried local files on the memory card, internet radio and files from my computer over upnp. It just buffers the files and then pops up an error message that says "unable to execute command. Try again." What happened? It was fine as of a few hours ago.

I suppose re-flashing would fix it, but I'm wondering if anyone has a less drastic solution.

Thanks for any help.