I have disabled all WordPress plugins.
Things were pretty normal before I switched to PS.
All the memory is taking my php5.cgi processes and hence the site is down though I am not experience any great traffic at the moment.
When I reboot the server, things get normal for few seconds and then php5.cgi processes consume all the memory bringing the site down.
The support sent me this mail - “You may want to consult your statistics to help determine where the most activity is.” I am not sure how to proceed now since I know its the php5.cgi processes that’s taking the site down.