Event ID 5013 on a DMZ WFE SharePoint server

I have a small SharePoint farm with 2 internal WFE servers and one in DMZ. In the last couple of days I had a situation twice where the DMZ server returned a “HTTP Error 503. The service is unavailable”. I found the following error in the logs:

Log Name:      System
Source:        Microsoft-Windows-WAS
Event ID:      5013
Level:         Warning

Description:
A process serving application pool 'app_pool_name' exceeded time limits during shut down. The process id was 'XXXX'.

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Doing the iisreset fixed the problem in both situations. Any idea why this is happening and how to fix it? Is the server really performing a shutdown? Why?
MisUszatekAsked:
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colly92002Commented:
Its probably just the app pool recycling.  This task will have been scheduled automatically.

You can schedule it yourself by following the procedures here:
http://technet.microsoft.com/en-us/library/cc754494(v=ws.10).aspx  (IIS 7)

http://support.microsoft.com/kb/332088 (IIS 6)

Why its failing to recycle is another matter - check your event logs and see if there is any underlying problem.

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