Garmin HRM Tri Failure mode (after battery replacement) - YouTube
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 Instinct heart rate monitor problem : r/Garmin
Problem with Heart Rate Monitor - fēnix 6 series - Wearables - Garmin Forums
FR935 - cracks on the heart rate sensor. How does that even happen?? : r/ Garmin