ar60run hangs intermittenlty high cpu tulization

Issue with a custom report execution (ar60run hangs intermittenlty).

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In our e-business suite environment, ar60run process hangs intermittently for one particular report.  When the process hangs i dont see any activity being carried out by ar60run process (tried truss ouput, and i dont get any) , but the unix process is still active with a high cpu utilization on the server.

And the process doesnt terminate or returns any error, the ar60run process remains active untill we terminate the request.

The report we are generating is a 200MB custom report (34000 pages), and as mentioned earlier the report does complete successfully some times (it take around 80mins when it completes successfully).