I've said it before and I'll say it again: A big part of Fitbit's problem is the poor hardware quality of their products, especially considering the high price. A lot of people, me included, will never buy another Fitbit after having been burned. Their warranty only lasts one year, yet I've had to replace both Fitbit devices I've had twice within that one year. I'm now Fitbit-less because the latest, a Charge HR, fai…
In my case, getting burned was quite literal. I had a Fitbit Force and was one of the thousands who wound up getting a chemical burn on my wrist from wearing the device. It took about six weeks for it to subside.
Fitbit's response was sub-par. They finally did recall all the devices, but it took them way too long to admit a problem existed and to act on it. They initially dismissed the whole thing as potential sensitivity to metal, when clearly something different was going on.
A TV station spent a year filing FOIA requests with the CPSC, etc trying to chase down what happened. The best they could come up with was that perhaps trapped sweat in the charge port could get converted to sodium hydroxide when you plug in the charger, and that would imply that you got a lye burn on your arm.
http://abc13.com/technology/possible-cause-of-fitbit-rashes-...
The burn that I had was definitely localized right to where the charge port would contact my wrist.