Very high RAM usage, resulting in failure of server

Hello I have install CWP on my server (configuration mentioned below). As the days progress the Memory keeps on increasing and in 5-6 days it reaches to 99% and CWP will hang and on my vmware vSphere client I get error - the CPU has been disabled by the guest operating system. And I have to reset the VM.
This is the 5th I have faced this problem in 1.5 months period, Please let me know how can I resolve this problem.
Thanks in advance

CPU Model: Intel(R) Xeon(R) CPU E3110 @ 3.00GHz
CPU Details: 2 Core (2993 MHz)
Distro Name: CentOS release 6.6 (Final)
Kernel Version: 2.6.32-504.8.1.el6.x86_64
Platform: x86_64 [vmware]
Uptime: 1 day, 23:46
Server Time: Fri Feb 6 10:32:21 IST 2015
•  Memory RAM: 3.13GB / 6GB ( 52.2%)
•  Swap Memory: 0GB / 4GB ( 0% )

do you know how linux memory works ?

If you don't then check this site
http://www.linuxatemyram.com/

else show the output of the memory once it's full

Code: [Select]

free -m

Liked to watch the Ram Eater Penguin

There is a lot of usefull info in this webpage.
but HTOP report the great value on the status, and shows also the caching.

Also has nice testings for test/learn a bit http://www.linuxatemyram.com/play.html