2020 Chrysler Voyager

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 the dealer since I have read all the prior Pacfica complaints and I believe Chrysler knows of the problem. No one has inspected the vehicle. No warnings are presented prior to the sudden accelleration. My vehicle can demonstrate this fault at any time or place.