2021 M3 LR with no radar running software version 2021.32.21, and autopilot is all but worthless. Admittedly, on city streets with lots of traffic, where it was probably calibrated in California busy rush hour traffic and where there is lots of sensory input, it does pretty well. But leave the city for more rural roads and the frequent, aggressive ghost braking makes it completely unusable. Driving from Moab to Salt Lake City on long straight stretches this weekend and about every 2 miles it would quickly decelerate from 75 to 35. Sometimes there was a truck coming the other direction, in its lane, not over the line, and posing no threat. But sometimes there was absolutely nothing! This was basically in the middle of the desert. I've had this issue on freeways in Utah, Idaho and Oregon as well. If the road is rolly-polly (even with biggish, smooth hills) and there is little or no other traffic, Autopilot completely freaks out when it gets to the crest of a hill and cannot see over the other side, suddenly slamming on the brakes and scaring the crap out of me and my wife. Note to Tesla engineers: THE EARTH IS NOT FLAT. This happens both with autosteer, which I don't use very often, and with me steering. It was an issue with 2021.4.21.3 and I was hoping it would get fixed with 2021.32, but it's no better. I really wish that the Tesla just had plain old vanilla cruise control, even non-traffic aware -- just set the speed and the car maintains that and I'll take responsibility for not rear-ending the guy in front of me. The 2010 Mazda 3 that the Tesla replaced had "dumb" cruise control like that, and I would take that reliability over the buggy-phantom-brake-I'm-going-to-need-more-Tide-pods-to-clean-my-soiled-underwear Autopilot. I really like a lot of things about the Tesla, but not being able to use cruise control/AP on long road trips is a huge disappointment. My fear is that it's going to unexpectedly brake hard with someone behind me and I'll get rear-ended. So, I'm going to quit trying to use it. Does anyone else with a non-radar 2021 M3 or MY have this issue? Edit: I paid the $200 for a month of FSD to see if it works any better with that, but it behaves exactly the same.