after the last software update, the heart rate sensor records a flat heart rate after some time of the activity. I did a factory reset last week and it was fine for couple of days and it started showing a constant heart rate with flat line. this makes the stats it generates based on the heart rate useless. I don't think it's possible to have such a flat line after playing 1 hour of tennis or squash. any suggestions are welcome.
software version: 9.80
