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Thanks to all for these responses. These are interesting possibilities that I will try to monitor when and if it happens again.

There was no change in zoning or speed limit. Just miles of fairly straight, well-maintained highway at a constant speed limit with dry, hot sunny conditions. Not too much traffic. As stated above, one of the incidents took place with absolutely no one around me. For the other two, there was a...

That's a little difficult to describe, but I would say it was more of the near-screech variety. I say this because the car was breaking very hard, certainly harder than a 65 to 60 mph slow down, though not screeching or fishtailing, and only stopped braking when I got out of cruise control. I...

I could add that I was driving on a two-lane highway (two lanes in one direction, two lanes in the other) when the phantom breaking occurred. In the first two instances, I was in the left-hand lane and starting to overtake a car in the right. In the third incident, however, I was all by myself...

Moderator note: This plus the next (approximately) dozen posts were merged from a thread in a different forum. Just to add to the clamor. We experienced three closely spaced incidents of phantom braking with our Model Y while using cruise control without lane assist on highway 395 between Lone...