Server Application Unavailable

Lately I'm getting this error to often. It happens say each other day, but today, my website went down with this error twice !
Do you have any idea about what could be causing it ? Where should I look in my application for possible cause of these errors ?
 
This is typical of a pool that has a .net 1.1 and 2.0 in the same pool.

I have been having to spend at least 1 hour each day scanning pools for this.
 
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