Today while driving our new GC L Summit Reserve we were slowing for a stop light and a message came on the speedometer screen saying to put the car in park. At the time we were still travelling approximately 10 miles per hour so we of course couldn't put the car in park... When we did get stopped at the light and tried to start out again we noticed that the car had put itself in "park" and we could not change it out of park. Out of frustration and trying a number of different things, we eventually shut the ignition off and restarted the car and this did allow us to put the car in gear. It was a very unnerving situation... has anyone else had this happen?