XSJobs getting inactive after few hours

Hi

I am running a job through admin tool in SP09.The job contains few procedures.
The problem is that the job is getting inactive after few hours(2-3 hours).I am also not getting any error details.

I have also passed the session time which is more than the actual time required to complete the job.But still the problem is same.
Can anybody please help in fixing this problem.
Thanks in advance.