Mine stopped working several days ago and after doing all the things Fitbit recommends (restarting the Fitbit, rebooting the iPad, disconnecting and reconnecting the Bluetooth). None of these helped me. After reading something on this site, I dis connected my Fitbit from the app and reset it up. This seemed to work, I did lose all my data that hadn’t been sync. After less then 24 hours it did the same thing, I’ve disconnected and reconnected the fit bit from the app 5 or 6 times over the past 4-5 days, losing data each time.
then today, based on another comment on this site, I decided to go look at the App Store to see when the last time this app was updated on my IPad — my iPad is supposed to automatically do all updates. Well the last update in my list of apps for the fit bit app said it was updated 5 days ago. Just about the time my problems started, so I clicked on the app update in the list and it took me to the store (I wanted to see what they updated for any further clues). At the store the app didn’t say “open” like and updated app will say — it said UPDATE. So I clicked on the update button, I took 2-3 minutes to complete the update - when the button said open,I opened it and could tell the app was in the process of syncing!! All of today’s data is there. I’m not sure if this is going to be the final fix, but it’s been reacting so much better than it has for 5 days.
hope this helps
