Either a design flaw or quality control flaw that makes these harnesses unreliable. I've now had my third strap in eight months and the same problems persist: 1. The strap shows a low heart rate (usually 72) until 10-15 minutes of use.2. The bracelet stops measuring the heart rate after a few hours, showing 72.3. To be honest the strap works perfectly half the time. But 50% is a bad estimate! Garmin changed the band twice for free, but I really don't want to change it every four months! Today it stopped transmitting halfway through a 60 mile journey. No amount of belt adjustment could make it work properly.
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