NHTSA Complaint #11487169 — 2019 TESLA MODEL 3

I was traveling approximately 70 mph in passing lane when I engaged (standard) autopilot, as I approached to pass a vehicle with another vehicle following me in the same lane as I was traveling. My vehicle (phantom) braked hard to which the wheels began to squeal slightly and the vehicle behind me had to brake hard to avoid hitting my vehicle. I almost immediately applied pressure to the accelerator pedal to avoid a complete stopping of the vehicle and to which the vehicle responded to accelerate. And I disengaged the autopilot immediately by applying an upward motion on the gear stock.