My new Sense (old one replaced after it went kaput while swimming) has a serious problem with the heart rate sensor. It gives me double the heart beat of my cardio oxygen sensor, and the oxygen sensor works only sporadically. The fixes proposed by FitBit Customer Service are: Restart the watch, put the watch on the dominant wrist in lieu of the dominant wrist. The fixes for the heart rate monitor are non-existent, and remain a problem that FitBit has failed to address. This problem also manifested itself when I had a VERSA in 2018, and 5 years later it is still a problem.
This is my last communication regarding FitBit; I refuse to support a company that doesn't back it's products and is only interested in the bottom line, and the Apple Smart Watch is looking very attractive.
