Gaussian error : any help?

Dear CCLers,
 I have this error reoccuring with a number of different calculations
 sometimes at the beginning sometimes after a day or so calculation
 time.  Any help?
 Error termination request processed by link 9999.
  Error termination via Lnk1e in
 /prod/codes/castep/gaussian/g03/l9999.exe at
 Sun Nov 30 06:45:11 2003.
  Job cpu time:  0 days  5 hours 16 minutes 17.5 seconds.
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 Dr. David W. Price MA CChem MRSC      Tel: +44 (0)118 982 5087
 Visiting Research Fellow,
 Department of Chemistry,              Fax: +44 (0)118 982 5024
 University of Reading,                mailto:d.w.price!at!reading.ac.uk
 Whiteknights,
 READING   RG6 6AD
 U.K.
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