Php-cgi died from time to time and restarted

[escavern]

i have very bad problem with Nginx+Php-fpm,, my website always hang for
few times and when i checked with "TOP" via ssh it shows
Php-cgi process are like suicide/gone and then respawn again and it
makes my visitors feel very bad.. after i check the php-fpm log files it
shows php-fpm children like ordered to respawn.. here is my php-fpm log
files:

http://pastebin.com/ywLYq4RR

and here is my php-fpm.conf :

http://pastebin.com/fCW3KDD2

please help me if you know what is really happen with my php-fpm..
i already gogling this but still can;t find solution. thanks

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,219827,219827#msg-219827