It appears that, due to an excessive number of apache connections, the webserver reached it's MaxClients allowance, a setting that limits the maximum number of concurrent connections that can be made. This value is already at a high value (150) in relation with servers memory.
Probably some page are using too causing too many apache connections and using too much memory.
Top CPU (36.0%) Intensive Process: [php] <defunct>
Top CPU (33.0%) Intensive Process: /usr/bin/php /home/xxx/public_html/[url removed, login to view]
Top CPU (29.0%) Intensive Process: /usr/bin/php /home/xxx/public_html/[url removed, login to view]
Daily traffic of our website is less than 10000. The number of visitors online at the same time usually are less than 20. So the maxclients allowance of 150 should be enough.
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includes/[url removed, login to view] admin/includes/[url removed, login to view] use persistant mysql connections that may reduce the cpu and lower the socket count.