Sporadic Error in XLMP

Question

I get the following error (sporadically) when submitting a XML Publisher Report.
Sometimes it works and other times it doesn't... totally random behavior.
XML Report Publisher 5.0
Updating request description
Waiting for XML request
Retrieving XML request information
Preparing parameters
https://preproderp.cae.com:443/OA_CGI/FNDWRR.exe?temp_id=1185035120
null
--Exception
null
oracle.apps.fnd.cp.request.FileAccessException
     at oracle.apps.fnd.cp.request.RemoteFile.getFile(RemoteFile.java:434)
     at oracle.apps.xdo.oa.cp.JCP4XMLPublisher.runProgram(JCP4XMLPublisher.java:718)
     at oracle.apps.fnd.cp.request.Run.main(Run.java:161)
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Answer 1

Can't be... I'm running them in two separate steps. This is happening with the Oracle Check Format. First we issue (or Format) the check which is really the Oracle report with XML Output, then we submit the 'XML Report Publisher ' which should be picking up the xml output of our earlier step.
Thing is that sometimes if finds the xml output and other times it doesn't. Now I should tell you that we are running a RAC environment, and I have a feeling that XML output is only being written to one of the tiers.
Is this a possibility?