I know there is a thread on here regarding an issue with the 480, but I wanted to get this seperated from that discussion so it does not get lost. I bought my unit in April and the last trip out, the screen has been fading in and out. It still pulses, light works, menu comes up, but the screen will fade out. It will come and go. Does this sound like a voltage issue? I know they don't draw very many amps, but I'm sure it still needs voltage. Any similar issues with this unit? It happens when the motor is running or not.