Tuesday I was driving on the interstate between Joplin and Springfield, Missouri on autopilot and about 30 miles into the trip the auto lane change function ceased functioning. Autopilot continued to function. Oddly enough it started diving for exit ramps again about the same time, which it has been very good about not doing since 7.1. When signaling for a lane change on autopilot, it refuses to work but if I nudge the wheel even slightly while the turn signal is on it will disengage autopilot. I rebooted the console and the cluster and the behavior remains the same. When I pull into my garage I can see that all of the ultrasonic sensors are firing. Two days later and the lane change function is still non functioning. I had the SC pull logs and nothing showed up. They contacted Freemont and they searched more deeply and found nothing. The SC will take a look at the car next week to try to figure it out.