Cruise Control problems of the 2017 Infiniti QX60

2 times now in the last few weeks while using adaptive cruise control the car decided to take off. I watched the cruise speed go from 70 to 80 without any input and the car rocketed to 100 miles and hour. Braking would slow it down but as soon as I took my foot off the brake it would speed up. I tried turning the cruise control off and that didn't stop it. I cycled it on and off about 5 times but it kept speeding up. My wife told me to turn the cruise back on and leave it and that is when it finally stopped. She told this same incident happened to her two weeks ago and that was he only thing to stop it. I have never seen the cruise accelerate that quickly prior. It was very scary and easily could have killed us or anyone we may have run into. We were fortunate it happened on a business loop of an expressway. The incident seems to started when we left the regular highway and I was toggling the cruise to a lower speed which it was doing. I was going from 78 to 60 then by itself went to 80 and beyond. Previously I had witnessed the adaptive cruise not stop like it should and have to apply braking, which I reported to the dealership and was looked at without any answer. This incident felt like my car was being hacked and someone else was having fun with it.