Apache process using 100% of CPU

Multiple times daily there is an apache process that hangs and uses 100% of the CPU (it's a dual xeon). It is apache and not PHP, so I don't know how to identify what's causing the problem. Other apache processes come and go just fine while that one process continues to hang.

If I simply restart apache, everything will run fine.

How do I determine what's causing this apache process to hang?

 

 

 

 

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