NHTSA Complaint #11503026 — 2021 TESLA MODEL Y

I was driving on a large, multi-lane, divided freeway (5 south Interstate just before Anaheim, CA in Orange County, California) and using adaptive cruise control (not autopilot) to maintain my speed in the mid 70s MPH. It was around 9pm PT and there was very light traffic. The next car in front of me was at least 100 feet ahead of me and there weren't any cars on the left or right of me. All of a sudden the car started decelerating really quickly, and by the time I pressed the accelerator to counteract the deceleration, the car was at roughly 60 MPH. There wasn't any indication as to why the car decelerated so suddenly, and there wasn't anything that I could see that might have caused the cruise control to react that way. Thankfully there wasn't a car close behind me - if there had been, it's possible that the trailing car could have hit me and caused an accident at high speeds. I've read online that there are quite a lot of reports of "Phantom braking" from Teslas, and from the descriptions I've read, my experience seems to be exactly the same. I hope that NHTSA and Tesla can work together to get to the bottom of this and prevent these types of scary incidents from ever happening again.