I've had this issue for a while now. There are times that the key won't shut the vehicle off, only pressing the brake does. The dash lights will come on after the car is off (even while you're away for a while) and the brakes shut it off. You can hear the fuel pump go every time it clicks on, so it's like you turned the key on every time, but only the brake shuts it off. We've had to replace the fuel pump recently as well (not sure if it's related but it could be from overuse, every time the dash lights kick on) I've come out in the morning many times to find the battery dead because the dash & radio have been running all night. We've changed the ignition switch - no change. ANY suggestions would be great!!! Thanks!