what do you mean it stoped working, was it off , you couldnt see anything, you touched the nav screen while in map mode and the screen didnt scroll to the direction that you touched (actually this happens with me) some times if i touch the screen in map mode it doesnt respond this happens if the navmenu button is up on the lower left hand corner thats because the map is waiting for you to touch one of the newely highlitable buttons (nav menu, POI etc..) and wont let you touch anywhare else on the screens if this happens just press the map button (actual button on the left) again and that will turn the map back to normal and you can touch the screen and guide it where ever you want to go.