I have the new Galaxy watch, received on 7th September and after 1 recorded exercise the heart rate monitor is flatlining after 10 minutes.
First run below
Second recorded walk
I am annoyed as I want to keep track of my heart rate during exercise. I also wonder if this effects the calories burned if it cannot record the heart rate correctly.
This appears to be a common theme for Samsung watches as my husbands S3 did the same, purchased Sept 2017, at the beginning of the year.
Galaxy watch active not fit for purpose. the small plate at the back came off while i was out walking. I did not take the watch off and it stopped working. Samsung wont cover it under warranty as they say there was liquid damage. the only "liquid" is perspiration. This was the second time in eight moths the back came off. What a piece of junk!