Hello there @ellieandneil, nice to see you around and thank you for bring this issue to my attention. Certainly this is an odd behavior from the Fitbit app. If this issue is happening on a daily basis I would recommend to restart the app as follow:
Log out from your Fitbit app and go to your phone settings. Access to the App manager option and look for the Fitbit app in your downloaded apps list. Once you are there, clear the app cache and data and proceed to "Force Stop" the app. Finish the workaround by restarting your phone. When your phone has initialized, go back to your app and try again.
This might not resolved the affected day, but it may prevent this issue repeat in the future.
See you around and keep me posted how it goes.
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