Earlier quoted context omitted.
My 2019 Subaru Crosstrek has adaptive cruise control, and i've had it hit the brakes pretty hard when there's nothing in the way. Luckily it doesn't happen often.
I have a 2021 one and it never hit the breaks with nothing standing in the way. I don't have the manual in front of me but IIRC, it should only activate without an actual obstacle if the circumstances are such that something may be confused for an obstacle (e.g., driving down a steep enough hill that the end of it may be detected as a wall, never happened to me but I've never done more than 25 deg slopes). I know you…
I second the suggestion to get it checked.