Help - Sites keep going offline on dedicated server w/Ensim

I am really starting to tweak over this problem. I have to guys who do web server management that can't seem to solve the problem, and they are pretty good.
Around the 27th of November, my sites started falling off-line. (Still have not determined the problem) All I have to do to bring them back online is reset apache in the admin control panel (ensim).
Now, these events seem to occur at random. No set time. No real indication I am told.
I run two vbulletin communities and host about 10 other very inactive static web sites. The most popular vbulletin community site peaks out at maybe 45 users, but is regularly about 20-29 during the day. No real stress on the server. Never see a load of even 1 unless I am mass mailing or something.
Has anyone else had this problem, sites just going offline? I've heard now that ensim has some problems in the last few versions? Others have suggested maybe a bad stick of ram?
It has been a month and a 1/2 since I purchased the server and moved my sites over ther, and it was problem free up until this point.
I could really use some input/help.
Thanks,
David

 

 

 

 

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