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Edge 130 & HRM-Dual

Three times in the past fortnight my new HRM-Dual has connected to my Edge 130 and recorded a flat HR of 60, 68 & 64 for each of those rides (there's links to the activities). My HR normally averages 118 or so.

This issue hasn't happened on other rides or when paired with my Forerunner 230.

Any thoughts?