ubuntu - Apache is running but not working -

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i running huge php-application on ubuntu server, using apache2, php5, mysql.

sometimes (approx. once month) page ist not reachable internet ("it's down"). weird thing is, service apache2 status says apache running. solution restart apache using service apache2 restart , works fine again.

the server load @ minimum , can't part of problem (i guess).

i know, description not detailed should be, not have more information.

any suggestions cause problem appreciated!

what have done see if server running? have checked if there processes? if ports open? if can access server localhost? if there's in error logs?


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