DML job queue problem

Hi,

I have created a .sql file which creates a strored procedure to sync my intermedia index on a job queue. The problem I am having is that my jobs seem to just stop, and disappear after a couple of days. Here is what I do to set up my job queues:

1. start my ctx server unix command line prompt:
   >ctxsrv -user ctxsys/ctxsys -personality M -log ctx.log &
   
2. load my .sql file: ////////////STORED PROCEDURE

                'ALTER INDEX PROD_INDEX' ||
                ' REBUILD'                                    ||
                'PARAMETERS ( ''SYNC'')'      ;

///////////CREATE JOB QUEUE VARIABLE JOB1 NUMBER;
BEGIN

        DBMS_JOB.SUBMIT
                    (:JOB1,
                        'PROD_INDEX_SYNC;'.
                        ((SYSDATE +1) + 710/1440));
        COMMIT;

Everything loads up fine, and the jobs show up when I select job from user_jobs, but if I manually run it using DBMS_JOB.RUN(12); the job disappears (when I select job from user_jobs). It also will just disappear after a few days. I'm not really sure what is happening.

I appreciate the help,

Thanks,

Craig

-- 
"We dance around in a ring and suppose,
But the Secret sits in the middle and knows."
Robert Frost