Apache and dreaded W (stuck sending reply)

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Ever get sudden spikes in Apache processes stuck sending reply state?
This explains how to figure it out better than I could:

As always, in case this goes away...
Here is a super boiled down bit:
1. Check error logs for Apache
2. Check server status (think mod_status module)
3. See lots of "W"?
  A.  Check for get's with high SS - and growing....
  B.  Find script where there might be issues with things that are not supposed to happen :-)
- this only applies if it happens during random times (i.e. think low load times).