NHTSA Complaint #11458674 — 2018 TESLA MODEL 3

While vehicle was engaged in autopilot and adaptive cruise control on the freeway in traffic it has intermittently accelerated toward the vehicle in front requiring the driver to abruptly manually press on brakes to disengage the adaptive cruise control in order to avoid colliding into the vehicle in front. It has also suddenly braked on the freeway when there was no object in front requiring the vehicles behind to abruptly slow in order to avoid collision to rear of the vehicle. This has happened multiple times over years. I did report it once to the manufacturer who could not explain or reproduce it. There were not warning messages or lights to demonstrate failure of the system.