Speed Sensor problems of the 2011 Jeep Grand Cherokee

This vehicle is equipped with a adaptive speed sensor that keeps the vehicle at a preset distance from the vehicle in front with cruise control on. Vehicle is also equipped with a forward collision warning system which warns the driver to brake if it senses an approach of an object that is unsafe. The problems: the system will shut it self off, flashing a warning that the forward collision warning system is not working and shuts off the cruise control as well. System always resets itself after minutes, or longer and the cruise control will once again, work. Safety issue the system has the ability to brake on its own if it senses you are approaching a vehicle too fast with cruise control engaged. The problem is that a car may turn off in a separate lane to decelerate or be in a separate lane to accelerate and the sensor thinks the car is in front of it and starts braking severely cause it thinks it is in its path. This is a huge safety concern since any driver behind me would not be expecting me to brake when cars are not in my path. The vehicle has been to Jeep dealer for numerous attempts to fix it. Right now Chrysler is not doing anything about it. According to the repairing dealership, if Chrysler did decide to replace the part, its on back order.