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Not sure if anyone can advise at all but the last two runs I've been on I've had problems with my heart rate monitor not working - the first run I'd go from a ridiculously high to a ridiculously low heart rate and the second run it just seemed to range from 50 - 70 all the way through.
I was wondering if it was to do with the cold weather and if anything could be done to fix the problem? I wrapped up really warm on both days. Althoujgh the watch is about 2 years old the strap is only about 3 months old.
Thanks in advance.