Problems with Private Messages

[FCIN]

I'm wondering why PM's often seem to sit in the outbox for long periods of time. For example, I sent a PM on 20110311 at 20:52 hrs and it sat in the outbox for almost 48 hours before it appeared to actually be sent. This has happened a couple of times. Don't think I'm doing anything wrong, but just seems like the messages don't always get sent immediately.

Thanks!