2008 Jeep Patriot 4X4 drivetrain & axles problems

Tl* the contact owns a 2008 jeep patriot 4x4. While driving with the cruise control set at 70 MPH, the transmission warning light illuminated causing the vehicle speed to independently drop from 70 to 40 MPH. The vehicle was taken to the dealer several times for the failure. The computer was reset however the failure persisted. The vehicle was taken to a second dealer where the contact was advised that the failure could only be diagnosed while it occurred. The manufacturer did not provide any assistance.

I had just filled the tank as usual and drove about 500 yards to a red light. In the past after a fill up, the jeep would stall and "buck" around 30 MPH, as if it couldn't get into gear, even though this is a CVT. I thought this might happen again, but it didn't this time, which was curious. At the light, upon attempting to accelerate there was no response from the throttle, and the car remained in drive, but refused to move. I could not shift out of gear into neutral.