hourly restarts

#1
Every hour, on the hour I get this error

At [03/Dec/2013:18:00:05 -0600], web server with pid=5845 received unexpected signal=9, no core file is created. A new instance of web server will be started automatically!

http://screencast.com/t/nvE4jVPUJ

Any Idea fo the cause....We have other shared servers, with the same configuration...Just not the restarts?
 
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