Accounting task shutting down

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A couple questions regarding this.....

1) I set up a Notification on ACCBATCH1 but it only seems to work when we manually stop the task, not when it randomly shut down.  Even though the server is still activated.  Any ideas on how to get around this?

2) What are some causes of the Accounting task stopping?  There was no server restart, etc. and the server is still activated.  Trying to figure out what is triggering this.  Thanks!