Attempted to read or write protected memory- while generate a snap

Hi all,
The shotshot agent is generating a snapshot, I got the error ' Attempted to
read or write protected memory. This is often an indication that other memory
is corrupt'. Then, the agent failed. I tried to restart the agent and
generate a snapshot again. This time, it run normally. So far, I got this
error twice since the replication launched. Kindly advise. Thanks a lot.
The only potentially relevant ref I coulod find was this:
http://support.microsoft.com/kb/926421
If it doesn't apply, then I'd raise a support case with PSS.
HTH,
Paul Ibison