Does the car still roll with the trans in neutral and the parking brake engaged. Could be an easy way to check on a hill to make sure the parking brake is working.
Most owner's manuals state that on an automatic transmission cars to:
Park the vehicle
Put gear selector in Neutral
Set the Parking Brake
Let off the brake pedal
Set the gear selector to Park
The ones I have read state this to avoid the symptoms you have.
Otherwise take the car in for warranty.
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