nginx stops after 16 minutes exactly...or php-fpm..i don't know what is the problem after i do restart and wait 16 minutes i get the error 502 bad gateway...i been trying to fix this problem for 3 weeks and i could not fix it...i tried different linux operation systems and same thing happens, i tried many nginx versions same problem...im losing my mind please someone help me now i use Nginx version 1.10.3 ubuntu 16.0.4