CentOS Server Crashing

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http://www.unix.com – Over the last month or so my CentOS server has been crashing for reasons I do not know. It has been running for over a year with regular yum updates without problems. The load on the server is perfectly normal with CPU usage at 5-6% and RAM usage at less than half of 32GB of RAM (multiple smaller game servers run off of this box). I am unsure if this is a software issue at all. I have pasted my /var/log/messages file around the time of my latest crash all the way up to the crash. Because I am a CentOS newb, this is gibberish to me, so I am curious if anything in the file points to a crash of (HowTos)