I agree the braking is getting worse. Particularly with vans and lorries - if you are passing them and they drift slightly to your side it will slam on the brakes, even though they stay within their lane. The other thing causing it is when you go under a motorway bridge and their is no hard shoulder, so the crash barrier comes from further away to right next to you, the car braked very hard on the A1 on this.
My temporary solution is to keep your foot on the accelerator when you think this is about to happen, a bit of a push on it will override the braking.
The third thing, which I think is just poor programming, is when you pull out to overtake something, that car begins slowing down as if you are driving straight towards them, and only accelerates again once you are fully in the outside lane. Best way to avoid this is to pull out much earlier. I used VW's TACC in a Polo and it actually does the right thing and starts to speed up as you're pulling out. Annoying that Tesla with all its software can't seem to get these simple things right.
If I were to guess, I'd say they are concentrating so much on trying to get FSD working and on roundabouts etc, that they've forgotten about the normal use-cases which we are all using every day.