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Heart rate measurements too high since update

Ever since the latest software update, my optical HR readings are at times a good 10-40 bpm higher than my actual pulse rate (as checked manually and with a HRM strap), even at mostly rest (getting 120 bpm readings doing light seated stretches or slowly walking around at home). Any fixes to this coming down the line if related to the update? 

  • I had something like this happen when I went from one activity (walking) right to another (rowing). Only the HR kept going up even after I took off the watch and started over. It went way up into threshold.