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Hi @VC64 - this often is caused by a phone setting that is not quite right. Generally it can be caused if the phone closes the Bluetooth or Fitbit App to save battery. A logout and login can also restore things, as can restarting the phone if it hasn't been started recently.
Author | ch, passion for improvement.
Best AnswerThere is a post from LizzyFitbit on the Sense community about this issue. She recommends:
It worked for me.