NHTSA Complaint #11483763 — 2022 TESLA MODEL Y

My car came with a factory hitch adapter. I was hauling a flat bed trailer with a load of about 10 20' 2x4s on it home for my foundation. At approximately 65 miles per hour, out of no where, with no other cars around, on a sunny day, and on a straight section of 2 lane road, the car suddenly applied the brakes hard, to the point that I was afraid of the load on the trailer shifting and hitting the car even though it was tied on well. This is just the worst example of this annoying behavior that I can't seem to disable on my new Model Y. It sort of like riding a horse with a mind of it's own, and so you're never sure when this mare will spook and come to a stop and throw you off. You might say that there was no damage done, but that's like saying that if someone tried to break in your front door and failed, then you're ok. Of course you're not because it leaves emotional damage when this occurs. I'm scared to drive the car because of it.