We have a server that has recently gotten into an issue where the TTFB (Time To First Byte) takes 2.0 minutes to pass on some subpages of a website. Some other websites, hosted on the same server, does not experience. The wierd part is that when this is happening it seems to be always 2 minutes, hinting something is timing out, but the response is 200.
What could be causing this extremely long TTFB ?
The webserver is a Ubuntu version 10.04 running Apache 2 with PHP 5.3.2