Automatic Transmission Torque Converter problems of the 2012 Jeep Liberty

I am experiencing torque converter shudder at between 45 and 50 mph at 1500rpm or lower. I first reported this defect when the vehicle had about 800 miles on it. The vehicle feels like it's driving over rain grooves or rumble strips when I'm experiencing the problem. The issue is 100% reproducible. The dealership has insisted that this is a condition that affects all Jeep liberties called "exhaust drone. " during one of my many service visits for one of my many other service issues, I had a rental 2012 Jeep Liberty that did not have this problem. Jeep customer care has been unsuccessful in even contacting the service manager at the dealership where I bought the vehicle because he does not return their calls. I am concerned that the torque converter will fail during regular use and leave me either stranded or cause an accident. Also, the vehicle intermittently shifts very rough, and on several occasions when I am starting the vehicle it surges forward or backward suddenly even when applying very little pressure to the gas pedal, and this is accompanied by a very loud knocking sound. Sometimes the vehicle makes noises between 15 and 25 mph, which I can only describe as a loud high pitched whining or warbling sort of noise (like a loose flywheel).