I took my wife's car out today and noticed that the speed readings were half what the car speedo was. I tried rebooting but there was no improvement. I removed the camera to clear it and when I played the videos every one ran at least double speed. I had downloaded videos from it last week and all was well, as were the speedo readings when driving. I tried a number of different viewers but the speed was the same with all. The videos from my own 512 show no problems when played using the same software.