Board Thread:Support Requests - Getting Technical/@comment-26978548-20190208140614/@comment-168424-20190208181711

Yeah, this is sort of a security measure. You can't sit in the editor without publishing for too long because the website thinks you might be trying to session hijack or some other nefarious thing... so it prevents the submission from sticking. Technically it's some kind of token expiration, in all likelihood.