Fenix 5 and Edge 530. After MTB ride recorded by Edge 530 lactate threshold BPM falls to 46 at Garmin Connect. Returns back to normal after running activity recorded by F5 with Garmin strap. Next MTB ride - again 46! It began in sometime in April. Fenix 5 shows correct LT BPM in user settings. I kindly welcome your suggestions how to fix it.