I was charged close to $700 for my radio that had no sound. Once I picked up my car it started doing this all day reset of my navigation system. I took it back to Lexus and was told that there is a master reset to navigation systems that are having this problem. My car has been to Lexus 2 times for this same problem and it still doesn't work correctly. This morning it started working and I know later on going home it will go back to the restarting things it's doing.