Continuous tracking is ON.Make sure continuous heart rate monitoring is turned on
Deep sleep registers sometimes but not all the time.And if deep sleep is not registering you may need to do a full reset one time.
I sort of get the same thing. Most of the time it does but it seems if I wake a lot it does not. And it never registers as much as my Fitbit Ionic did. That said I have no idea which was more accurate. Looking at averages I say the Fitbit and Samsung could use an update on deep sleep.Deep sleep registers sometimes but not all the time.