Nginx+PHP-FPM intermittent blank page
Hello, I been suffering with this problem for a few days on a new server, some times like 1 or 2 times a day the Home page of wordpress shows a blank page with a 500 error (only visible from Chrome console) and it stays like that for a couple of minutes where not even a hard refresh (ctrl+shift+R) seems to work, but eventually it comes back to normal. the only way to quickly fix it is to stop nginx, delete nginx cache at /var/cache/nginx/ and start nginx again.
The server is a CentOS 6.5, nginx/1.6.2, php 5.3.3 (php-fpm).
my site conf:
(maybe is a little tweaked from fail fix attempts but still functional 99% of the time)
The same error happens on a few selected pages but not in the post pages inside wordpress, so even when the homepage is blank the rest of the site works ok.
I use the same conf on other servers and websites but this is the only one causing me trouble, the main difference is this website has a lot more traffic (2k+ per hour).
I been looking around for days but nothing seems to solve it, now about the pages where the error occur this pages read a TXT file with a "cached version of the page" which is refreshed/rewritten every 2 minutes, this help us to load super fast the homepage (and some internal pages) which usually take a few seconds more to load without the "cache" text file.
Note: We use CloudFlare but the error shows even if I use my hosts file to connect directly to the server (no caching in the middle) my PC <--> Nginx
Any ideas or suggestions would be really helpful.