I have this same issue right now on my 2015 for about the past couple years and I can’t figure it out. It’s when I have to press pedal again without rolling over like 5mph maybe. So like drive thru lines it engages from stopping and starting and also backing up or pulling forward where I have to control speed for a period of time, especially down hill, it will engage. What did you find to be the fix and has it stayed working properly?