The contact owns a 2016 Ford F-150. The contact stated while driving 55 MPH, the transmission unexpectedly downshifted, causing the vehicle to dramatically decelerate. The contact then pulled over to the shoulder of the roadway. After restarting the vehicle, the vehicle returned to normal functionality, but the failure became a regular occurrence. The aœService Transmissiona warning light was illuminated. The vehicle was taken to an independent mechanic, who diagnosed a failure with the powertrain control module. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 19V075000 (Power Train); however, the VIN was not included. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA hotline for assistance. The failure mileage was 145,000.