No manual repro or network trace so far, this is for tracking
VE loses user token:
https://wmf.ci.cloudbees.com/job/VisualEditor-en.wikipedia.beta.wmflabs.org-linux-firefox/9/testReport/(root)/VisualEditor%20multi-edit%20workflow/Make_multiple_edits_to_the_same_article/
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=65710
https://bugzilla.wikimedia.org/show_bug.cgi?id=66076
https://bugzilla.wikimedia.org/show_bug.cgi?id=67171