I got a new XXL540TM for Christmas. Took it out and turned it on and it seemed to work fine. Yesterday I was going on my first trip and I turned the unit on and it was working okfor the first few minutes, Tthen it warned me that the battery was low. Whe I plugged in the usb charger, the screen got all these lines on it and faded out. When I reset it, It now shows the boot screen and the TOMTom Logo screen. Then lines appear and the TomTom logo screen disappears and thats it. It doesn't work. Any Ideas?