Dbms_job.submit - job is restarting but - not throwing any exceptions

We have a job that is a simple loop that looks for (wakes up by) looking for messages coming in using DBMS_PIPE.
The job has been restarting arbitrarily but - we're not seeing messages generated via any of the associated exception handlers.
No idea why it's restarting when it fails.... currently - I'm just looking for a way to have the dbms_job.submit call NOT automatically restart if it has issues.
Currently just calling as such:
DBMS_JOB.submit(jobno, 'pkg_package.listen;');
Running on 10.2.0.4.0
Any insight is appreciated.
Is there a way to prevent it from automatically restarting and - is there something I should be looking for specifically around dbms_job when it comes to the exception handling in the packages/procedures it's running??
Thanks.

We generate a log record in a table using an autonomous procedure when an exception is raised.
Where I'm seeing the log records stating an issue with the job - I'm also seeing the tracefile / alerts being generated.
When the job starts - we log a record stating it's started....
In many instances - I'm seeing it log a start but - there's no corresponding trace file (i.e. - it wasn't manually started - it was processing and - then - without exception 'died' - didn't generate an error but - just started up again).
I've no idea what's going on here. I've validated that everywhere through the underlying package the job is running that the exceptions are being logged. Yet - it's arbitrarily starting up again on some occassions (and - I can't seem to find any general commonality around when this is happening or - what would be causing it).
So - I'm thinking this is an issue with the DBMS_JOB or - something else funky going on....
As an FYI - This job is simply a loop that waits to receive a message on DBMS_PIPE that then fires off a package procedure when it receives the message.
In the interim - to alleviate data issues as a result of it processing the same data twice - I'm trying to prevent it from auto restarting... is there a way to do this?

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