My wife stopped for gas, turned off the car, then turned the radio on. After filling up, she tried to start with push button start. The brake pedal was locked and would not allow her to depress it (mandatory to start vehicle). Unfortunately, she can not recount the exact sequence of button presses she went through for the next 5 minutes, but the brake finally unlocked. Is there a safety feature that prevents the car from starting that was activated? If so, how do we avoid it and how do we unlock it?