PGMailService Crashes

[pagrusr]

The PGMail Service, as told by Event Viewer for Windows 2000 Server, SP4, crashes on an intermittent basis.
I have not been able to correlate the crash with any particular situation.

The scenario is that the PGMail Service stops, and the crash (sometimes) happens on the restart of that service.

Here's the event log text from the most recent:
=================================
Event Type: Error
Event Source: PGMailService
Event Category: None
Event ID: 1
Date: 12/14/2005
Time: 2:23:08 PM
User: N/A
Computer: <HOSTNAME>
Description:
The description for Event ID ( 1 ) in Source ( PGMailService ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. The following information is part of the event: Service stopping failed : "Access violation at address 0041763E in module 'PGMailServer.exe'. Read of address 00A5697C".
===============================

The Pagegate version is 4.0

What do I need to do to resolve this problem??
Thank you.