Orbeon seession issue while running on clustered Weblogic 10.0

We are running Orbeon 3.8 in a cluster on weblogic 10.0 server and we are getting issue.

 Session has expired.Unable to process incoming request.

This issue is sporadic and does not come every time. Orbeon works well while running on one node.

Does Orbeon 3.8 supports running on cluster. Can anyone help me with this issue.

2011-06-10 14:57:53,675 ERROR ProcessorService  - Exception at line 55, column 65 of oxf:/ops/xforms/xforms-server.xpl (reading processor output: name='response', id='xforms-response')
org.orbeon.oxf.common.OXFException: Session has expired. Unable to process incoming request.
            at org.orbeon.oxf.xforms.processor.XFormsServer.doIt(XFormsServer.java:201)
            at org.orbeon.oxf.xforms.processor.XFormsServer.access$000(XFormsServer.java:63)
            at org.orbeon.oxf.xforms.processor.XFormsServer$1.readImpl(XFormsServer.java:94)
            at org.orbeon.oxf.processor.ProcessorImpl$ProcessorOutputImpl$1.read(ProcessorImpl.java:1092)
            at org.orbeon.oxf.processor.ProcessorImpl$ProcessorOutputImpl.read(ProcessorImpl.java:1238)
            at org.orbeon.oxf.processor.ProcessorImpl.readInputAsSAX(ProcessorImpl.java:445)
            at org.orbeon.oxf.processor.pipeline.TeeProcessor.access$200(TeeProcessor.java:35)
            at org.orbeon.oxf.processor.pipeline.TeeProcessor$TeeProcessorOutputImpl.readImpl(TeeProcessor.java:89)
            at org.orbeon.oxf.processor.ProcessorImpl$ProcessorOutputImpl$1.read(ProcessorImpl.java:1092)
            at org.orbeon.oxf.processor.ProcessorImpl$ProcessorOutputImpl.read(ProcessorImpl.java:1238)
            at org.orbeon.oxf.processor.ProcessorImpl.readInputAsSAX(ProcessorImpl.java:445)
            at org.orbeon.oxf.processor.ProcessorImpl.readInputAsTinyTree(ProcessorImpl.java:472)
            at org.orbeon.oxf.processor.ProcessorImpl$3.read(ProcessorImpl.java:505)
            at org.orbeon.oxf.processor.ProcessorImpl.readCacheInputAsObject(ProcessorImpl.java:551)
            at org.orbeon.oxf.processor.ProcessorImpl.readCacheInputAsTinyTree(ProcessorImpl.java:503)
            at org.orbeon.oxf.processor.pipeline.choose.ConcreteChooseProcessor.start(ConcreteChooseProcessor.java:191)
            at org.orbeon.oxf.processor.pipeline.PipelineProcessor$5.run(PipelineProcessor.java:647)
            at org.orbeon.oxf.processor.ProcessorImpl.executeChildren(ProcessorImpl.java:620)
            at org.orbeon.oxf.processor.pipeline.PipelineProcessor.start(PipelineProcessor.java:644)
            at org.orbeon.oxf.processor.pipeline.choose.ConcreteChooseProcessor.start(ConcreteChooseProcessor.java:251)
            at org.orbeon.oxf.processor.pipeline.PipelineProcessor$5.run(PipelineProcessor.java:647)
            at org.orbeon.oxf.processor.ProcessorImpl.executeChildren(ProcessorImpl.java:620)
            at org.orbeon.oxf.processor.pipeline.PipelineProcessor.start(PipelineProcessor.java:644)
            at org.orbeon.oxf.pipeline.InitUtils.runProcessor(InitUtils.java:90)
            at org.orbeon.oxf.webapp.ProcessorService.service(ProcessorService.java:100)
            at org.orbeon.oxf.servlet.OrbeonServletDelegate.service(OrbeonServletDelegate.java:138)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)