Alarm Clock has uncaught exception

Hi, my Blackberry Curve alarm clock gives me an uncaught exception.

Sometime it works fine, but some times it:
1. Lights up the screen.
2. Pops up the Alarm Dialog
3. The tune doesn't start, and the following message appears:
"Uncaught Exception Application net_rim_vad(24) is not responding;
process terminated"

Does anyone have any idea of what's going on, or how to fix it?

Thanks
Eric

You can never tell when it is and isn't going to sound the alarm. When it gets into that mode, however, it stays that way until you do a complete reboot by taking out the battery. Pain in the neck, and potentially a real problem if you were to sleep through a meeting or something.