I wondered if it was a problem reading the disk. The car is under 3 years old, and done 20k miles, is this young for a laser to go? It's still under warrenty, but suspect I'll have to take out my intrevee & resler before I take it in. It also has a few navcoder additions! I'll try another disk in it to see if thats the same. The problem at the moment is it's quite intermittant.