Require small clarification on scheduler

We have a scheduler which runs for every 2min and 5hours a day. From my observation it is find that these schedular are running fine for some duration of time. But after that,the status of scheduler is running but couldn't see any log for that. Even if I make it INACTIVE and run it again it doesn't run.
If we create a new scheduler again and if we run the new scheduler,then its working fine.
What may the reason that the old scheduler stops running and doesn't run again even if we start it ??

If the task is throwing an exception which is not handled and goes up the stack to the quartz scheduler class, it can block the thread.
I would say to check the log file (also see if you have the correct loglevel) for such exceptions.
Btw, is it a standard task ? or a custom one ?
Octavian

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