What is causing CloudFlare 502 errors only on some pages?

ANSWER: This rare issue is caused by certain plugins from what we’ve observed, including the following:

“Yeah, after poking around a lot yesterday we found out why: the plugin “Divi custom modules” ended up on an repeated loop when it was used on pages or posts without an excerpt, resulting in these 502s for pages or posts using the plugin!

Not sure if would be useful for you guys but perhaps if someone else who uses your WP services who happens to use DIVI theme and the Custom Blog Modules plugin faces these problems with 502 pages, you could let them know it’s the lack of an except that causes this error. Adding it in basically solved it.”