A friend, who got me interested in the devices, had the same issue. His died. Mine, I stopped using, when it detected I was asleep for 3 hours one night and I

A friend, who got me interested in the devices, had the same issue. His died. Mine, I stopped using, when it detected I was asleep for 3 hours one night and I was definitely up and using my phone for the entire time. The only reason I got it was to monitor my sleep. It is apparently useless for that.