The contact owns a 2021 Buick Encore. The contact stated that after parking the vehicle and shifting to park(P), the vehicle failed to immediately shut off. During the failure the message ‘Shift to Park’ was displayed. The contact stated that the failure was intermittent. The cause of the failure was not yet determined. The manufacturer and local dealer were notified of the failure, but no assistance was offered. The failure mileage was 57,000.