I have a Zumo 550, used it today, disconnected it and when I plugged it in to return home, it would not turn on. Have tried charging it and nothing happens. Battery was at a full charge when it was turned off. This happened once before right after I bought it, took it back to Best Buy, they got it working but wouldn't tell me what they did to get it working again. Has anybody else had this problem. It is only one year old 5/25.