I've been having the same issue - the only way I've been able to fix it is to uninstall and reinstall the app. Have done this about 10 times over the past few days - v annoying. I've emailed FitBit support. Seems to be an issue for both Charge HR and my new Alta HR, so it must be a software issue, unless I've been incredibly unlucky with two devices... I notice that FitBit has issued a couple of new app updates over the last couple of days, so perhaps they are trying to fix it. Good luck! Lucy
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