That ended up being the case, @Doug_Den_Hoed__AtAppStore   Thanks for the tip!

Thanks, @skyehansen . User logs were a dead-end. Just shows my creation of the user on 6/22, then my repeated corrections of "Access Level changed from "Worker" to "Planner"" on 7/11, 7/12 and 7/14. @Doug_Den_Hoed__AtAppStore Thank you. I started a thread with our technology team to ask this questio...

A new employee joined a department of ~20 users, most with Planner access. I set up this new user as a Planner, with groups matching others in the department. Every few days, through no intervention of mine or the other admins, the employee's access is set to Worker. I've changed it back to Planner ...