one shoulder of the styled items to wear

My fitbit flex has stopped working. I thought it was dead but put it on the charger and it still had almost a full battery. I did a reset and it went crazy going in and out of sleep mode for a whole day. After a day of doing that and not tracking any steps, sleep, or active minutes it has going completely dead. When I put it on the charger the lights flash full battery, but when I tap it no lights show up and it doesn't go into sleep mode. It is still not tracking anything. It is right at the one year mark. Has anyone else had this problem? one shoulder of the styled items to wear