I'm in a vps with 512 MB ram now, my visitors per day is 10K and from top command, i just use about 200 MB. But, my vps is always got downtime everyday about 30 minutes. The CS said it is because my ram, the top command is not representing the real ram and recommend me to upgrade my ram to 768 MB. Should i upgrade my ram?
(This was the question asked by one of my friend now can you advise me what should i say him?)

