Exchange 2003 error

I am running Exchange 2003 on a Windows 2003 Server and am getting the following error message:

Event Type: Error
Event Source: MSExchangeAL
Event Category: Address List synchronization
Event ID: 8331
Date: 12/12/2003
Time: 2:07:36 pm
User: n/a
Computer: Exchange03
Description:
The service threw an unexpected exception which was caught at F:\titanium\dsa\src\lra\abv_dg\lservagent.cpp(4511)

The network administrator has re-entered the forwarders in DNS and rebooted, and that seemed to fix the problem for a day or so, but now it has returned. I have been hard pressed to find much info about Exchange 2003 since it is relatively new. Any help would be greatly appreciated.