Automatic Transmission Control Module Software problems of the 2017 Hyundai Sonata

The contact owns a 2017 Hyundai Sonata. The contact stated that while merging onto a highway at 50 mph, the vehicle independently decelerated to 30 mph and shifted into limp mode. The contact stated that an unknown warning light was illuminated on the instrument panel. The contact had initially taken the vehicle to an independent mechanic who was unable to determine the cause of the failure. The contact then had the vehicle towed to a dealer where he was informed that the failure was linked to a software update. The manufacturer was not notified of the failure. The failure mileage was 56,000.