Was on a call and the call just cut out. The display was hung up on the dialer screen. I powered it off to unlock things, now it won't power up!!! ARGHHHHH!!!!!! Battery was at 20% at the time. Its been on the charger since. No Charging Battery Display. No reponse of any kind from any buttons. ARGHHHHHHH!!!! Anyone else see this, or have it happen to them?