2020 CHRYSLER VOYAGER Power Train Problems

While drivng with the cruise control engaged and encountering a downhill speed increase of about 5 MPH, the transmission kicks down to engage engine breaking. However as the process starts, first the engine revs and will increase vehicle speed by about 5 MPH. An example is cruise set at 60, down hill increases speed to 65, engine rev results in 70 MPH speed requiring heavy braking to regain control. I have tested this without the cruise engaged by shifting from D to L and engaging the kickdown process and engine accelleration in an identical manner. I have viewed the Chrysler Owner Forum and found many complaints of this occurance on Pacifica modesl since 2017. Most suggest it is a software problem. No component failed. My safety and the safety of others are at risk for the sudden increase in speed and demand for increased heavy braking. I have not contact...