> Hi, I'm having the same problem for a few weeks
> now, after x hours/days php becomes unresponsive,
> I've already changed 2 different php-fastcgi
> spawning scripts and tried php-fpm as well,
> switched between many version of the php 5.2 and
> 5.3 branches but the problem still remains so I
> don't think it's a php issue even if that would be
> the most logical conclusion.

You are probably have too many concurrent connections from nginx
to your php-fastcgi application. Try to increase listen queue to 1024
or something to handle your load spikes, benchmarking or whatever
causing it.