8525 - Incoming E-Mail Sound Won't Play

[samcham]

I have an 8525, with the latest ROM. No matter what notification sound I select, the sound won't play most of the time when I receive a new e-mail. It will sound occasionally, and I haven't noticed any pattern to this behavior. It will vibrate when a new e-mail is received, if I have the entire phone on vibrate.

Any ideas as to why this is happening, or how to fix it?