NHTSA Complaint #11572897 — 2023 TESLA MODEL Y

On almost a daily basis, with the cruise control set to maintain speed (vs the option of advanced speed control that will adjust to signs), the car will inexplicably and quite randomly decelerate aggressively at highway speeds. On four separate occasions just today (although it happens at least once or twice a day), with the cruise set to 70 MPH, the car will randomly decelerate aggressively or even change the max speed of the cruise to 55 MPH. On all occasions, the posted speed limit is 65 or even 75 mph. This is dangerous, particularly in DFW traffic during rush hours, with traffic flow moving at similar and often higher speeds in close proximity. Having my car aggressively decelerate without warning to 55 MPH has caused me to be tailgated and honked at. This has been happening since I've received my car. At first, I tried to use the advanced features of the cruise, but whilst driving on the Dallas Tollways, where the toll road has a speed limit of 75 MPH and the regular highway paralleling at 65, the car is unable to differentiate and would often interpret the wrong speed limit and aggressively brake. Going from the flow of traffic (close to 80 MPH) to 65. This is why I switched the cruise to absolute speed rather than any sort of posted adaptive. It's seems to have gotten progressively worse. So much so that I only use the cruise where traffic is light because of this issue's unexpected and random nature. Besides being dangerous, it's also very scary as it's completely unexpected and aggressive. I did make a service support call, but the Tesla technician said it's a known issue and no data available if/when it may be fixed. Currently, car is running software v11.1 2024.2.3