Intermittent api.RMDirectoryException: Resource not found

Hi -

We are experiencing intermittent issues with Process Flow Server - we have a simple SQL ETL flow which normally takes 2-3 minutes to run - however at some points in the day it can take 1.5 hours to run and throws an error in our log.

Our pfrmi.log shows the following error message:
(DB Return Code = 0)
[Jun 11, 2010 9:51:36 AM] User not found in Lawson. Resource not found
com.lawson.lawrm.api.RMDirectoryException: Resource not found

I'm thinking this is an issue with LDAP connection pool or thread pools on WAS, however I'm posting to see if anyone else out there has seen this error before? I increased PF HEAP to 512/1024.

We're S3 9.0.1.4.199 Windows 2003 32 bit on VM, WAS 6.1ND 32bit.

Thanks!

Rob