01-05-2023 11:59
01-05-2023 11:59
Charge 5 is fluctuating HR drastically during cardio workout. Much of the HR is recording below zone. less than 65bpm for periods of time when actual HR is between 145 to155bpm. This results in incorrect tracking calorie burn. Have tried tracker on both wrists and have the same problem. My wife is also experiencing similar problems. We have owned these Fitbits for a couple of months. Never had this problem with earlier trackers (Charge 4, Inspire 3).