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Heart rate drops to No zone for some time incorrectly?

Heart rate drops to No zone for some minutes, when actually it should raise? I was climbing a 2 km segment. It has happened before with my Vivoactive HR, but my hope was, as this is much more advanced monitor, to have it correct on this one :( 

P.S. In some minutes it returns to normal values, but the average is incorrect for the whole ride. So disappointing. 

  • Come on, it happens every time. Are there bikersMountain bicyclistin the forum to confirm this? Heart rate suddenly go away (no zone) when pushing the hill, showing <60bpm. Normalises when done climbing.