received unexpected signal=9, no core file created

#1
Hello,

I'm using LiteSpeed/5.0.9 Enterprise with Cpanel (CloudLinux 6.7), it ran smootly over few months, but starting this week it continues restart around 10 times a day with following notification email:

At [06/May/2016:09:49:49 +0700], web server with pid=423762 received unexpected signal=9, no core file created. A new instance of web server will be started automatically!

Can I enable core dump in that case or the way to see why it's restarted
 
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