While we appreciate this, it's not a scapegoat. *Sure it's only happening to our site, but that means there is something between our site and your server that's not being liked. *
Do you have any other sites on the server that have such a high CGI load? *CGI takes quite a bit of CPU power, especially on a higher traffic site like this one. *Keep in mind, usercount != site count. *We have plenty of people who just lurk,and never register.
Could it be a problem with the max connections? *max clients? *Max requests per child? *Something to that effect? *That *could* give THIS site a 404, or a 500, while the other sites are up.
Thankyou for taking the time to work these problems out with us.