Navigon works fine until I plug my Griffin PowerJolt SE into my iPhone. If Navigons running and I plug the Griffin into the iPhone (or start Navigon after I plug in) in 1 Minute the screen dims and then shuts off (like it would with any other app running) except Navigon *continues to run with the screen off. If I hit Home and slide unlock Navigon opens immediately and is tracking exactly where I am (not where I was when the iPhone shot off). It will then stay on and not dim or shut off. However the voice no longer works. Oddly even if I unplug the iPhone and close/restart Navigon (even days latter) it still exhibits this same behavior (cuts off in 1 minute and no voice). I must **power off the iPhone in order for Navigon to work correctly again. * I do have one other App that can do this called iTrail. Although it keeps the screen on for about an hour before cutting it off and still running. ** Was using Navigon and powered off the iPhone (to reset voice and screen lock). Waited a couple of minutes (a mile or so) and pushed the power button. After the normal slow boot up (spinning wheel) I hit the Home key and slid the lock. Low and behold Navigon was still running (the same Navigation route) and was immediately at my current position (with voice and screen lock restored). How on earth could this be?