This morning, the NAVI systems keeps rebooting. It goes to the "Enter Code" screen. I attempt to enter my code and it will allow me to enter 1, 2, or 3 of the numbers, but never all 4, then it reboots and comes back to the "Enter Code" screen again.

I had this problem a couple of days ago and I took the disc out and reinserted it and it worked fine until today. Does it sound like a dirty disc to anyone? I am going to go buy one and try that. Any help or ideas in the mean time would be appreciated, as always!!