Processflow Failing Occasionally

Hello,
We have a Processflow that basically performs an approval on items ordered from our clinical system. The flow works fine, but occasionally the work unit has an error and it doesn't process. This happens a couple times a day, but the majority process just fine. I have included the error below. If anyone has an idea of what may have caused this I would be glad to hear it. I have contacted Lawson and they believe it has to do with our Websphere tuning and want me to engage Professional Services. This worked before we upgraded to 901 with no problems.

ErrorLog in Process : CERNERREQ_V08 Workunit : 10313, ActivityType=AGS, ActivityName=Approve, ActivityId=AGS4 Date:07/15/2010 Time:08:05:13
Error while executing Transaction Activity .....java.lang.Exception: Error connecting to http://ourserver.com/servlet/Router/Tran
saction/Erp?_PDL=PROD&_TKN=RQ13.1&_EVT=CHG&_RTN=DATA&_LFN=TRUE&_TDS=IGNORE&FC=Approve&RQH-COMPANY=0100&RQH-REQ-NUMBER=0144435&_DELIM=%09&_O
UT=TEXT&_EOT=TRUE with user pfadmin Query string
at com.lawson.bpm.coreutils.CGIInvoker.invoke(Unknown Source)
at com.lawson.bpm.coreutils.CGIInvoker.invoke(Unknown Source)
at com.lawson.bpm.coreutils.CGIInvoker.invoke(Unknown Source)
at com.lawson.bpm.database.transaction.Transaction.doQuery(Unknown Source)
at com.lawson.bpm.database.transaction.Transaction.doQuery(Unknown Source)
at com.lawson.bpm.processflow.workFlow.flowGraph.FgaAgs.startActivity(Unknown Source)
at com.lawson.bpm.processflow.workFlow.flowGraph.FgActivity.execute(Unknown Source)
at com.lawson.bpm.processflow.workFlow.flowGraph.FgProcess.run(Unknown Source)
at com.lawson.bpm.pfengine.ProcessFlowEngine.execute(Unknown Source)
at com.lawson.bpm.pfengine.ProcessFlowEngine.startProcessAt(Unknown Source)
at com.lawson.bpm.eprocessserver.KBConnection.startProcess(Unknown Source)
at com.lawson.bpm.eprocessserver.KBConnection.startProcess(Unknown Source)
at com.lawson.bpm.eprocessserver.KBConnection.execute(Unknown Source)
at com.lawson.bpm.eprocessserver.KBConnection.run(Unknown Source)
at com.lawson.bpm.eprocessserver.util.ThreadPool$PooledThread.run(Unknown Source)