I started experiencing this on Friday after getting my car back from the service department. It worked on the way home, but later that night it would not. I called Tesla and they took logs for the local service center. We verified the sensors were clean and rebooted the car. The service center reviewed them and determined I needed to bring my car in for calibration on the following Wednesday. Meanwhile cruise control (and of course autopilot) would not work. We drove a 250 mile trip, so this was quite annoying. Long story short it started working again on Sunday evening. It has to have been software related and not hardware right? Anyone else experienced a 2-3 day blackout on autonomous features like this?