After working perfectly fine since I got it, I woke up one morning and took the watch off the charger as it was at 100%. To my surprise it would turn off and not turn back on. I was so confused. I figured it died and I read it wrong so I put it back on and it turned on and said 100% again. Once again it turned off and would not turn on as I took it off. It seems as though it only works on the charger. Any suggestions?