NHTSA Complaint #11452805 — 2018 TESLA MODEL 3

“Phantom emergency braking” problem while autopilot engaged. Will go from 65 to 45 or sometimes lower. Occurrences are unpredictable. There are no apparent causes. If I set driving speed to be 65, I expect it to remain at 65 unless adaptive cruise control reduces the speed for a slower moving car in front of me or if there is a detected potential for a collision. This problem causes driver anxiety. The fear is someone behind who is not paying attention or following too close rear ending the vehicle if it brakes suddenly. Sometimes I wonder if a bug hit a sensor or camera and caused the braking, but it doesn't always happen in the same location. It's jarring. I've tried adjusting other settings like crash avoidance detection, but it hasn't made any difference. This has been happening since taking delivery of the car, but I expected a software fix to be implemented before now.