Weird Problem

 Hi,
We recently migrated our database from Solaris 9i to Redhat Linux 11g. Ever since the migration, the web server starts to throw the same error once per day in the morning at around 8:30 am except weekends. Yes, only once per day in the morning. I grab the sql statement and run it in TOAD at 8:30am but it runs fine. Any idea?

Error:

ORA-00600: internal error code, arguments: [16609], [0x098A172E0], [3913], [0], [], [], [], [], [], [], [], []

SQL statement:

   SELECT   crse_id,
           term,
           class_section,
           enrl_cap,
           class_nbr,
           sc_descr,
           LTRIM (
                 MAX (emplid1)
              || DECODE (MAX (emplid2), NULL, NULL, '; ' || MAX (emplid2))
              || DECODE (MAX (emplid3), NULL, NULL, '; ' || MAX (emplid3)),