I'm using a FR 245 and my HRM Dual (relatively new) has been dropping out on me. Before this, I had a different brand HRM (optical) and it was doing this so I returned it. Now that my new HRM Dual is doing the same thing, I wonder if the issue is with my FR 245.
I wet the sensors and my skin with water before my run. It is comfortably tight around my torso, positioned just below my pectoral muscles (as pictured in the instructions).
Any thoughts? Here is my latest run.
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