I have a 2019 bolt ev (mileage approximately 10k) that automatically shifted gear to "park" mode from the "l" mode and slowed to an almost stop while i was on the highway at rush hour driving approximately 65 mi/hr. i was able to safely steer the car to a median and call on star after repeatedly shutting power off and back on again. i was able to connect with on star for live diagnostics showing a failure in the hybrid control processor (p0a78). i arranged for the vehicle to be towed to the nearest dealership and has been under repair for the past two weeks. gm sent the dealer a "control module" as replacement but this didn't fix the problem. recently, the dealer called to inform me that the transmission will be replaced but neither the dealer or gm provided a root cause for the failure. gm has not provided any indication whether this is an isolated or known issue, however, i gathered from public forums that other bolt ev owners have experienced somewhat similar unexpected shifts in gear to park.*dt*jb