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Heart Rate Off

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For the last 2 days my Fitbit has been registering random times during sleep as heart rates as high as 185.
I wake up in the morning it shows I've burned 1700 cals overnight which would be great but I'm sure is not accurate. This morning when I checked it, it was at 120 when my resting heart rate is 58.
Any idea how to fix or why this is happening?
Thanks!

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My heart rate has been very off or tracking stops while I’m hiking. I have to stop to make the heart rate stop tracking, what appears to be steps, especially when I’m climbing a hill. In other words, the heart rate goes off most during heaviest exertion—and either drops from the 160s down to ~112 or it stops tracking beats all together and shows my resting heart rate. 

It seems an update might have been pushed to all Charge devices because I’m seeing similar complaints for the Charge 4.  

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