Speed Control Cable problems of the 2018 Ford Explorer

My wife and I leased a 2018 Ford Explorer platinum last Saturday. We wanted to upgrade to the latest technology. I failed to ask specifically if the adaptive cruise went to zero mph for stop and go traffic. The window sticker said it had "adaptive cruise control". I have had two cars with adaptive cruise and they have both worked down to zero mph. During our first drive using the so-called "adaptive cruise", we were following a car on the freeway going 70mph. Rather suddenly, that car slowed. Our Ford was slowing down beautifully; you could feel and see the effects of the automatic braking. Then, suddenly and without noticable warning to us, the braking quit and our car was coasting towards the car in front. We narrowly missed a low speed rear-end collision. I would call this cruise control a "partial" adaptive cruise control. I really feel this aspect of the adaptive cruise should be more prominent in all of the literature as well as on the window sticker. . I cannot imagine what would have happened had the deceleration been extremely fast from 70mph and our cruise control disengaged and the braking suddenly quit! this is very dangerous when you are used to a car that will continue braking all the way to a stop. I do considerable rush hour driving and am in stop and go traffic constantly. Other car manufacturers are able to build cars with a cruise that goes down to zero. Why not Ford? I would even hope that a software/firmware update could make my car cruise go down to zero. That would be such a great safety update to offer customers. I believe standards should require zero mph capability from adaptive cruise controls and would hope Ford could be made to fix this rather dangerous device. Any manufacturer using such a partial adaptive cruise system should be made to note that prominently on the window sticker and in the literature.