I was driving my 1200 mile new 2002 M5 when all of a sudden the nav screen started to flicker. I wasn't able to turn the monitor off and to my surprise the nav screen started to slide to show the hidden tape deck, then it closed, then it opened, then it closed, back and forth ....this went on for about 2 minutes. Finally I pulled over and turned off the car. After I restarted the car everything was alright. Has this happened to anybody before?