java.lang.NullPointerException

[scc35]

I have a user who sets up jobs to run lots of different report views (some jobs have as many as 10 report views, some jobs have as few as 1).  We've just upgraded to 8.4.1 and now when the jobs run and they try to create large PDFs (over 1000 pages), we get a java.lang.NullPointerException error message and a status of "Failed" in the job history.  The funny thing is that the report view PDF is almost always still created and placed in its proper place.  I've opened an SR with Cognos support but so far they haven't been much help.  I'd appreciate any thoughts on this.  Thank you.