Hi all. While the Compass was in for repair my wife picked up a Dart as a rental. I don't know what year or trim other than to say it had cloth interior that didn't strike me as cheap cheap, it had a touch screen, power windows all around and I believe 17" alloy wheels. Of course I looked under the hood to see the 2.4. To my question, yesterday we took it for a bit of a ride before it went back today. I had the cruise set at 111km/h and I must say it held the speed really well with no dramatic shifting or odd behaviour on hills. Shortly I encountered a slower car and used the cancel feature to follow. Once I saw my chance I stepped into it and overtook the other car. By the time I get to pull back in I'm going 135-140 and pressed resume on the cruise. It shut itself off. ( the cruise ). I don't believe I went to WOT at any time but I can't be 100%. After several attempts I could not get the cruise to engage. The system would engage and say it was ready but shut off once the set button was pressed. Only after the car was shut off and re started would the cruise work again. So is this a problem with this car or is the cruise programmed to behave like this? For this model or all across the car lines? What exact offence did I commit to upset he system?