We had purchased 2 bands. My band has been okay. However, my wife’s band has been giving her some issues.
At first, she kept getting notifications every 5 minutes to activate Alexia which she did not want to do. Called support and they said it will be fixed on a possible firmware.
Now after a firmware, her battery drops in less than 2 days for her band.
One thing I want to add is I haven’t really taking mine off however, there was one point where the band didn’t report any activity for a few hours on mine.