Hi I recently notice a slowness when accessing my sites on my dedicated servers. Here's how it goes. I rebooted the system and everything runs normal. After 5 minutes, the slowness begins. Then I'm not able to access any of the sites on the server at all. During the meantime, FTP-ing is working normal. I stopped Apache and restarted it, problem fixed. Then after few minutes, it slows and stalls again. Any ideas where to begin?

System:

Redhat Linux 9.0
Apache version 2.0.40