I have mine set that it comes on with the key and off when i take the key out, never turn it on and off manually. The last couple of weeks i have noticed when i start the car up it doesn't come on and have to switch it on manually. It's intermittent, most of the time it comes on. I have noticed when it happens and i switch it on manually the buttons don't light up as they should when the dash lights are on. Only a reset or turned off for a while it works ok again. I updated the software and still does it. Any ideas? Is the unit going faulty?