From my experience, this might be due to bug in 5.6 version of os/kernel.
We had a similar report from one of our customers.
Try to roll it back or upgrade to other OS.
If you did not find any thing from /var/log/messages
check cron jobs by "crontb -l"
I did all the steps. but when i use /etc/init.d/syslogd restart or syslogd service start it's
saying now syslogd.
Please help me to install it on centos 5.6 x86_64.
You can see /var/log/messages or
vi /etc/syslog.conf and add this line
When you say it shuts down services do you mean they crash ?
What does /var/log/syslog say when it happens ?
Could it be Apache is too busy and fails or there's bad Wordpress code executed causing it to