I am also having problems with the GPS lock. Was testing it out this morning in the car and it would only lock 5% of the time (on and off), with about 15meters of accuracy.. the rest of the time, it's not able to stay locked. I found that the way you hold (or place it inside the car, has to be flat) it has a big impact on the lock. In my opinion, this is completely unusable (as Google maps navigation thinks I am about half a city's distance away). I will try the suggestion above and see if it helps, but I'm doubtful. My previous phones had absolutely no loss of lock and accuracy below 5 meters on the exact same route.