Gabriel Koen

PMC Post Savior checks every 15 seconds to see if you’re still logged in. If you are not, it presents a pop-up window so that you can log back in without losing your work.
Github: https://github.com/Penske-Media-Corp/pmc-post-savior
WordPress.org: https://wordpress.org/extend/plugins/pmc-post-savior/
Image by <a href="http://www.flickr.com/photos/library_of_congress/2890279022/" rel="nofollow ugc">The Library of Congress</a>. See link for details.

PMC Post Savior

Never get unexpectedly logged out when saving a post again.

PMC Post Savior vs Password Protected — Lock Entire Site, Pages, Posts, Categories, and Partial Content