NHTSA Complaint #11452551 — 2021 TESLA MODEL 3

When driving with Traffic Aware Cruise Control and Autopilot the car will randomly apply the brakes in causing a severe drop in speed frequently from 70 MPH to less than 50 extremely quickly. This happens primarily on undivided highways with no pattern - sometimes when other vehicles are approaching, no distinction between large or small or color, but most frequently and most violently occurs when no vehicles or obstacles are present. This sudden drop and alarm notification from the car can cause me to quickly jerk the steering wheel in response and potentially losing vehicle control. In some occasions this happened at highway speeds with people behind me almost causing a rear-end collision. I put in a repair notice with Tesla and the response was that the TACC and Autopilot are beta and upon review of trip logs they noticed no faults and closed the repair request. This feature is unsafe and since a cruise control is a necessity for my frequent longer trips, having a car without a functioning cruise control is beyond inconvenient, it is a safety issue. The breaking has also occurred on divided multi-lane roads but less frequently and with less severity.