Exchange / ActiveSync - Works for a day or so, then stops

I've had my iPhone 3G since launch and have configured it to work with my Exchange 2003 server utilizing activesync at work. It will connect and sync fine for a day or so, however then it will start giving me a "cannot get mail" "cannot connect to server" error message. The phone has plenty of signal and can reach the net, the exchange box is online and functioning properly. If i delete and recreate the account on the iPhone it starts syncing properly again, however it's only a matter of 24-48 hours before i have to repeat this process...any suggestions?

tritonj said:

talk to your IT department, they manage the server

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I am the IT department. The problem is not with the server as demonstrated by it working when the phone account is deleted/recreated at the phone level. We have numerous other users utilizing activesync with push without issue.