Many thanks for your reply. I am using a genuine maps DVD. My wife just drive the BMW for 40 miles and she reported back to me that everything was back to normal. The problem was when I had the music cd in both cars. When I took the cd off at a service station, the sat nav in the
mini went back to normal. When my wife drove the BMW to work she did not have this music cd in and she said everything was fine. I know it sounds crazy, but I am now convinced there is an impact of the cd on the sat nav. I have been using the moded OS. For a few months now, it was only today that in both cars (both with the music cd in) kept crushing. I know it is hard to believe, but this is what happened.