Apache at random serves blank pages

on new setup

[notdku]

I am having this issue with a new box where Apache at random serves blank pages and won't serve anything but until it's restarted. I see no errors in /var/log/messages either to show why this is happening.

It's not all pages either just several various ones. I know it's not a programming issue either because the only thing the server is running is one instance of vBulletin.

I look at top during this and CPU and RAM usage are very low.

The only fix to get Apache to serve the pages is to restart it.

Anyone have any clues on what it could be?

I set my php.ini memory limit to a gig (I have 16 gigs in the sever) but that was no help.