apache sometimes failing to load php pages

I am not too sure what is causing this.. but apache sometimes fails to load php pages. It would say page is not found but then when I refresh it, it will display the php page properly. I am sure it is not the php page itself as there are several others affected on this machine. I tried recompiling apache but it didn't seem to help. Anyone know what could be causing this? I know restarting apache tends to fix it but not for long it will start having this glitch again... apache status doesn't show anything irregular.

 

 

 

 

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