Came here looking for solutions to the same issue and funny you mention this. My 2019 is in for the second time for ACC issues. The first time it happened about 6 months ago when I was backing up with a hitch tray and the car didn't like it. Dash lit up right away and they had to recalibrate it under warranty. This time I had nothing connected and I was driving on the highway when the dash started going crazy. Car is at the dealer today and they asked me if I have been towing anything like a trailer or camper. I haven't towed anything since my first few weeks with the car and that was over a year ago. Thought it was weird they asked that but it seems they may now suspect the same thing.