I got my 40mm active2 LTE watch a few weeks ago and it's doing EXACTLY what yours is. I am using the watch face with the heart. It shows your heart rate and the last time it was measured. As I am sitting typing this it says it last measured it 21 minutes ago. I have it set to measure every 10. When I am sitting for a long time my Samsung Health app shows readings only every hour or sometimes less. And mine behaves the way yours does at night. Samsung, would you please respond to this question/issue? Thanks.
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