What would cause apache to do this?

I have recently setup a forum (vb) and within 4 days I have 168 members. Some of them including me have mentioned this error.
At one moment the forum seems fine, running fast and so on. The next minute I will start to see broken images then get a error

Forbidden
You don't have permission to access /somevbfile.php on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.


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Apache/1.3.34 Server at www.domain.com Port 80

Then I would close IE and open site again and all would be fine.
I hired TSM to secure the server.
I disabled mod_security and still does it.
Server has Zero Load
Dual Xeon 3.4 GHZ HT and 4 Gig of ram. It only does it on this site. But the other sites on the server do not have as many concurrent connections.
Is this something simple?
Please help What would cause apache to do this?

 

 

 

 

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