First I think the phone is terrific and exceptionally capable. I have been using the car windshield mount holder / charger. To the point...... Navigation worked fine for the first hour of use then the Map froze and I had gone 40 miles up I-190 to the end before figuring this out. I powered down, went back to home page, re-opened nav and it worked for around 15 minutes before freezing again. Then it froze after 5-6 minutes. Called VZW yesterday and was told the best thing is to do a hard reset back to factory fresh, lose all added apps, back up contacts. The woman walking me through it was supposed to call me back to help me re-activate the "new" phone. She didn't so I called and someone else helped me with it. My contacts were all lost except 2 of them. She said there was a way to get google to retrieve contacts that were synced the previous week. Anyone hear of this? She didn't call back and no one else at verizon knows anything about this. Back to the GPS Navigation..... After the reset, the map doesn't freeze, it just disappears after 15 minutes which is about the time it takes for the phone to get good and warm. Now I don't have to shut the phone off but I go straight to apps and select Navigation again and the map comes back and picks up where it should. Now it stays on for just about 5 minutes. Also, when the map disappears, the guide voice keeps talking but not loud enough to understand it most of the time. I descibed this to VZW this afternoon and they said go to a store and pick up a new X. Got there and you guessedit.... no X's in stock. They ordered one shipped to my home. Has anyone else here had similar experience with the Navigation app? Thanks.