First of all I am very impressed with this phone. I was using the GPS to navigate yesterday and on the way to the location about every 10-15 minutes the screen would switch back to the home screen and the map would go away. It would still give directions and if I repressed Navigate the map would come back. On the way home the map stayed on the screen the entire trip. ANy ideas? The voice search on this phone is great. I am very impressed.