If you happen to have too many users log in at the same time, someone gets kicked off. That makes sense, HOWEVER there should be a setting that prevents the whiteboard login from being on the list of users that will get kicked off. It would make much more sense for a different user/login to get booted. Anything with the "@whiteboard" login should be left alone.
Please note this is NOT the same thing as turning the setting to never log out.