Had an issue with the onboard computer. Started car, screen popped up, set Nav for home favourite. All ok so far. Selected reverse. Reversing out of parking space noticed main pop up screen blank, still raised up position. Then noticed Audi Splash Screen as the computer rebooted itself 2-3 times. Nav selected but on screen text reporting SD card 1 not found (can see 10 satellites) Restarted car at a set of traffic lights, still having same problem. Pulled in, stopped car, removed sd card. Cycled the car alarm. Restarted engine Cant see sd card, as expected. Powered down refit sd card Restarted engine, Nav now works but all my Favourites now gone. Should I have done as above except for the removing of SD card 1?