It doesn't just happen on Jailkbroken phones. This has been a known issue since the release of the 3GS.
I've experienced it once (so far) on my 3GS. Someone left me a voicemail on a Friday afternoon, but I didn't receive it until Monday morning.
Advice: Complain to AT&T. The more people that complain, the better the chances are that they'll acknowledge the problem.
07-29-2009 01:58 PM