PSA: Look at the heart rate sensor of your fenix 5. Has it cracks like mine? If yes, it's a common problem. Send it to Garmin and get a free replacement. Do
Garmin Fenix Optical Heart Rate Test | muppix.net
Garmin Fenix 5 Plus – TriDot Store
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fēnix 5/5S - Replacing the Heart Rate Monitor Battery