The issue relates to hybrid-system software, but it requires a trip back to the dealership.

In these vehicles, the Hybrid Powertrain Control Module (HPCM) may errantly shift the drivetrain into neutral, keeping the vehicle on but cutting drive power to the wheels, according to the NHTSA. In this condition, the vehicle will coast to a stop and automatically shift into park. Once shifted back into drive, vehicles will enter a limp home mode that limits power.