The Collision Mitigation System has spontaneously engaged 4 times with no obstacles in front or to the side of my car. 3 incidents were on city streets with a low rate of speed. The 4th incident happened on the freeway at about 65MPH! I had no vehicles in front of me or to the side of me but I had several behind me. The car came to a screeching halt on the freeway with a truck behind me. Thankfully the truck was far enough behind that he was able to maneuver around me. I was able to get the car going and pulled over to the shoulder of the freeway and threw up because I thought for a moment that I might die if the truck had slammed into me. It was very close and the truck driver was pretty angry as he passed. There were no obstacles in any of the 4 instances. I asked about the issue during the next routine tune up but was told they couldn't replicate it and no codes from the car. It's happened 4 times since June 2021 when I bought the car brand new from the Honda dealership. I'm scared to get on the freeway now after that last incident. They can't replicate it they said - so now what do I do with a car I can't rely upon to be safe?