I have a group of php websites / different domains that run off a single linux server (Centos). All of the sites are forums for the most part that run off a single mysql database. For some reason, one of the sites goes down multiple times a day. The others don't. The site that goes down receives the second most traffic but not the most. So the server should be able to handle the load. All of the sites are very similar in structure but not content. I bought the sites so don't know the intricacies of all of the code. I'm not a linux guy by any means (Windows guy) but have a tiny bit of linux experience that I've picked up during my troubleshooting. I've tried looking at logs but haven't figured out what's causing it. Any tips or suggestions on how to troubleshoot this? Step by step directions / commands would be greatly appreciated.