Left my phone in the car plugged in to charge and it was cold outside. After several hours I went to the car and got the phone and the battery was dead. I've tried recharging and it is acting strangely. The unlock lock buttons are bouncing back and forth. Then the locations I had been using in navigation are scrolling up and down at random. I can't use the four keys at the bottom of the unit (home, setting etc.) and can't use any of the touch keys. I can hit the off button quickly and the unit will shut off. Says 10% charge.