NHTSA Complaint #11512811 — 2022 TESLA MODEL Y

I have owned this car for about a year with ~10,000 miles of driving. Four times in the last year, during high way driving, I had sudden deceleration using adaptive cruise control of at least 20 mph at highway speeds. It seems to me that in each case I was to the left of a semitrailer truck and it appears to me that the imaging software believed the truck to my right was entering my lane. This is speculation as to cause but the circumstances are common. I regard the adaptive cruise control feature of Tesla’s Autipilot to be unsafe without extraordinary vigilance - which is not the purpose of cruise control. So I no longer use it. Tesla asserts there is no problem. This occurs during multiple versions of Tesla software.