Function reloading in SGA

I have a 9.2.0.4 database running on Windows that frequently runs into
ORA-4031 errors (about once a month).  The application has a known problem
with literal values in the SQL.  I have been monitoring objects in the SGA
to see if anything else is causing fragmentation.
I noticed that one function is loaded repeatedly, even though it is pinned.
It has been reloaded several times today (LOADS column value keeps
increasing in v$db_object_cache).  Now I know this happens when the object
is invalidated, however as far as I can tell it is not becoming
invalidated.  None of it's depended objects are becoming invalidated
either.  Or perhaps I should say - how do I know they are not becoming
invalidated?  There is no DDL occuring on the function or its dependent
objects.  The dependent objects are shown below. What else could be causing
this function to be reloaded?

Thank you,
Jay


SQL> run
  1  select * from dba_dependencies
  2* where name = 'GET_NEXT_SEQUENCE'
OWNER      NAME               TYPE              REFERENCED_O
REFERENCED_NAME      REFERENCED_TYPE   REFERENCED DEPE
---------- ------------------ ----------------- ------------
-------------------- ----------------- ---------- ----
MIS        GET_NEXT_SEQUENCE  FUNCTION          SYS
DUAL                 TABLE                     HARD
MIS        GET_NEXT_SEQUENCE  FUNCTION          PUBLIC
DUAL                 SYNONYM                   HARD
MIS        GET_NEXT_SEQUENCE  FUNCTION          SYS
STANDARD             PACKAGE                   HARD
MIS        GET_NEXT_SEQUENCE  FUNCTION          MIS
INTERFACE_LOG        TABLE                     HARD
MIS        GET_NEXT_SEQUENCE  FUNCTION          MIS
NEXT_SEQUENCE_NUMBER TABLE                     HARD
MIS        GET_NEXT_SEQUENCE  FUNCTION          MIS
DUAL                 NON-EXISTENT              HARD

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