I'm running apache2 on my Debian Sarge system, 2GB of RAM. I'm hosting about 45 sites or so, about half of them are barely used. The others see light to moderate traffic. All sites are Drupal sites, the open source content management system, running under fastcgi.
Every few hundred page loads or so, an Internal Server Error crops up. There is no rhyme or reason to them. They can occur on any attempted page load. If the user immediately hits refresh, the page loads without a problem.
Where can I begin to look for a solution to this problem?