Hello @EJW101
Welcome to the Fitbit Community. I understand that having to re-log into the Fitbit Dashboard can be frustrating. Apparently this is currently a known issue and has nothing to do with the iOS update. Please read the moderators note (page 1) here on this thread: https://community.fitbit.com/t5/Fitbit-com-Dashboard/Fitbit-Online-Dashboard-keeps-logging-me-out/td...
😃 I hope I was able to provide you with the best answer to your question.
Best Answer