I have this problem, too. Just to test to see if it's the same problem, one time let it remain in standby until you turn the car off again, then when you restart the car, see if it turns back on as normal. If so, that's exactly what mine does. I'm pretty sure it's a low-voltage-during-startup problem, which I haven't bothered to fix yet, as I've got at least two other problems going on as well.