This has happened to me a few times this year, usually when it's really hot (which I'm guessing is why it happens). The touch screen will lock up (the other buttons will work) and the map looks crazy. Happened today, so I took a picture.

This happen to anyone?

Hows the disc look? I had mine freeze once in a location in upstate N.Y. I just dragged the screen back to the location I was at and it worked again and never had a problem.