I've used Yoast to do my blog's meta titles and descriptions for years now. Out of nowhere, traffic dropped. Followed advice as to changing setting in media attachment urls, and a seo index purge plugin that was suggested. Still didn't fix.
When Yoast is on, using Fetch as Google, site is unreachable.
When Yoast is off, using the tool, site is reachable / available....
Problem is the 300 - 400 meta titles and descriptions I set up... anybody have any idea?