I have the same issue. I have intense activity while resting/sleeping. I noticed it records my activity as double. If you look at your time and steps, it duplicates. When I called Fitbit (3 times) They said it was a known issue with the charge6 and their is an update fix for my app starting April 1. I check each day but there is no new update. Also, my heart rate on my fit bit is unreliable. My coach recommended using another pulse monitor to check accuracy. My Fitbit is off. I’m not sure what else I can do. ( it said my resting heart rate was 220, while sleeping, a suggestion from Fitbit asked me to put my Fitbit on my charger, then press the button on the flat end of the charger (where it goes into the wall charger) for one second, wait a second, press again (repeat three times). Then, wait until the Fitbit logo shows on the face of the fit bit. Put the fit bit on snugly on your wrist, one (or two?) fingers above the bend of your wrist on the vein side. This helped and reset my 220 hb to a more normal amount. Hope this helps.
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