Well I have found myself a 64gb Samsung card from Carphone Warehouse, formatted it in my 412gw but still have the problem! The most common time for the problem to occurs is when the car has been standing for a while, the camera switches on OK and starts to record, the screen saver kicks in and blanks the screen, then a few mins later the screen lights up again, the 4 blue LEDs on the left light up, it is no longer recording, it might or might not start bleeping, the screen goes off but the 4 blue LEDs remain on and it then powers down leaving a corrupt mov file. Joy😡