Axis 2 returns 404 error...sometimes

I have an Axis 2 web service deployed in an Oracle app server. It works as expected most of the time, but sometimes a 404 transport error is returned to the client. If I loop through a request/response cycle, it seems to always happen eventually.

My question is, how do I go about debugging a spurious issue like this? Is there something I should be looking for in axis 2 on the server side to resolve the inconsistency? Thanks for any help.

org.apache.axis2.AxisFault: Transport error: 404 Error: Not Found
    at org.apache.axis2.transport.http.HTTPSender.handleResponse(HTTPSender.java:298)
    at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:192)
    at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:77)
    at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:327)
    at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:206)
    at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:396)
    at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:374)
    at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:211)
    at org.apache.axis2.client.OperationClient.execute(OperationClient.java:163)

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Axis 2 returns 404 error...sometimes

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