Cruise Control problems of the 2015 Ford Fusion

Adaptive cruise control the acc on my truck malfunctions unexpectedly and frequently when passing large trucks at highway speed. When it malfunctions, it causes collision warning systems to activate including unexpected and hard braking. I have taken the truck to the dealership where I purchased it twice for this problem. Once before and once after the recall. There was not change the first time and after the second time the problem was reduced in severity and frequency but continues to happen. My service department is willing to look at it again, but says there is nothing to do that they have not already done. The unexpected braking not only is a surprise to the driver, but it also may cause vehicles following to react inappropriately. This danger is exaggerated because it frequently happens on the interstate while passing large trucks.