NHTSA Complaint #11452964 — 2021 TESLA MODEL Y

While using adaptive cruise control on I-25 making round trips between Albuquerque and Ft Collins, I have experienced numerous (dozens) phantom braking events. They are so frequent that I have stopped using adaptive cruise control. Almost all of these events occur when there is no traffic and no discernible reason for braking. In many cases, my first response is to look in the rearview mirror since I'm worried that if someone is behind me it would cause an accident since the stop is very unexpected. To date, there has not been a close call. The stopping varies between slight hesitations causing 1-2 MPH decrease to dramatic decreases of over 20 MPH. I have made numerous 'bug reports' using my voice in the car immediately after many of the events. I also scheduled a service call but was told that they examined the software and could find no problem. There is no warning of an impending braking event.