Ability to Pull Emails from Exchange Server Fails after a Couple Days

[ChronoT52]

I've been trying to syncronize my Exchange server from work with my Evo4G. It works fine, pulling the calendar, contacts and emails from the server. After about a day or two, however, I'll stop receiving emails. I can still send them just fine. If I delete the account and recreate it, it will pull the emails again. I've done this twice now.

Any ideas why this is happening? I have a coworker that also has an Evo4G and does not have this problem.

Thank you very much in advance!