Steering Wheel Vibrate problems of the 2014 Jeep Grand Cherokee

The 2014 Grand Cherokee summit, was serviced on 7/30/15. I had the tires rotated and an oil change. The next day, I got on the freeway and proceeded to do 65mph when the front end and or the steering wheel started shaking violently. I am getting the tires balanced/serviced on 8/19/15 to see if that will fix the problem.

While travelling perfectly fine for 2 hours on an expressway, our vehicle became completely uncontrollable as the road became slightly slippery and we decreased our speed to around 45 mph. The steering wheel began shaking, the vehicle felt like it was driving itself, shimmying left and right uncontrollably. We could not correct the vehicle from slightly fishtailing even after removing pressure from accelerator and reducing speed to 5-10 mph and driving on the shoulder where there was more traction. We were totally unable to control the vehicle. We switched the select-terrain knob to "snow" to see if that helped, but it continued to be virtually uncontrollable. We were afraid to completely stop the vehicle due to all other traffic flying past us going normal speeds. The vehicle miraculously made it to a gas station right off the highway and was towed to the nearest Jeep dealer. The service department took it out for two different drives and could not replicate the problem. They hooked it up to their computer diagnostic system and could find no error codes. We also inquired if it was part of the p64 recall regarding the electronic control stability and were told no even though it seems similar to the problem that the recall addresses. This was the most terrifying experience we have ever had in a vehicle. If there had been any vehicles in our immediate vicinity at the onset of the issue, we would have been in a horrific accident. Two other similar, but less intense scenarios had happened before this one, both including the same feeling of being out of control, once on a rainy road service, and the other on an intermittently slippery road. Because this seems to be an intermittent problem and one that is a huge safety concern, we refuse to drive this vehicle on the road again.

When I drove the car at around 60 mph the steering wheel shakes side to side aggressively. The dealership changed two drive shafts and checked the balance of the tires. After all that it still shakes the dealership said it just how the Jeep rides no car or truck I've drove ever did that. I think its a safety defect in the steering at high speeds and all I drive is expressway driving. A new vehicle should'nt drive like this.