Help! Recently, my site (http://simplythreemusic.com) suddenly started to randomly not load a page, and instead return "502 Bad Gateway The server returned an invalid or incomplete response." If I refresh immediately, it returns the error again, after the same long pause of about 10-15 seconds. Then if I try again, the site loads again randomly. This has been happening off and on for several days now, both on the back end (ie. disabling a plugin) and the front end (ie. clicking a menu page like "bios" or "videos", randomly, both logged in as admin and not).
If you go to my site, enter site, and start clicking around on the menu pages, you should run into the error.
I checked with my host, and they said they have no problems with the hosting. I also have disabled ALL plugins, and the problem is the same.
I recently added custom header.php and footer.php files when I made my new landing page...Maybe I coded something wrong?
Thank you so so much for any help or advice guys!