Strange behaviour in SOAP connection mode

Hello,
I created a custom worklist app using SOAP connetion mode and I experiencing strange behaviour using it.
Sometimes it works and sometimes not. The only difference beetwen the two working config is nearly nothing. Just server restart are performed to make it work or not. No config files or applications deployement are done between two restart.
So It's lotery to get it work.
When it doesn't work, I have the following error messaging (see below)
Does anyone have a clue to get it work each time ?
Regards.
ORABPEL-30509
Error in invoking task query service.
A client side error occured in invoking the task query service.
Please check the exception error stack to identify the error. Contact oracle support if error is not fixable.
     at oracle.bpel.services.workflow.query.client.TaskQueryServiceSOAPClient.invoke(TaskQueryServiceSOAPClient.java:183)
     at oracle.bpel.services.workflow.query.client.TaskQueryServiceSOAPClient.authenticate(TaskQueryServiceSOAPClient.java:200)
     at oracle.bpel.services.workflow.query.client.AbstractDOMTaskQueryServiceClient.authenticate(AbstractDOMTaskQueryServiceClient.java:93)
     at eu.eca.itt.eworkflow2.controller.action.TaskListAction.process(Unknown Source)
     at eu.eca.itt.eworkflow2.controller.action.TaskListAction.execute(Unknown Source)
     at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
     at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
     at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
     at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
     at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
     at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
     at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
     at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65)
     at oracle.security.jazn.oc4j.JAZNFilter$1.run(JAZNFilter.java:396)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:410)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:623)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370)
     at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:871)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:453)
     at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:302)
     at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:190)
     at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
     at java.lang.Thread.run(Thread.java:595)
Caused by: javax.xml.soap.SOAPException: Unable to create SOAP connection factory: Provider com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnectionFactory not found
     at javax.xml.soap.SOAPConnectionFactory.newInstance(SOAPConnectionFactory.java:32)
     at oracle.bpel.services.workflow.query.client.TaskQueryServiceSOAPClient.invoke(TaskQueryServiceSOAPClient.java:131)
     ... 29 more

I also tried to change connection setting with
System.setProperty("javax.xml.soap.SOAPFactory", "com.sun.xml.messaging.saaj.soap.ver1_1.SOAPFactory1_1Impl");
System.setProperty("javax.xml.soap.SOAPConnectionFactory", "com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnectionFactory");
I get it work for ....... a day (or a restart I suppose) reverting back to initial settings to make it work again.
Does It mean SOAPConnectionFactories gets corrupted upon restart once I used them ?
Is a Service Request a good idea ?
Regards.

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