Owners/service Manual problems of the 2014 Infiniti QX60

On two separate occasions,the gas pedal on the car got stuck in the down position causing the car to accelerate uncontrollably. The first time was while accelerating onto the highway. When I let off the gas pedal, it stuck in the down position and I had to manually disengage it with my foot. The second time on 3/7/2015 at 2050, my wife was driving at a steady speed of 65 mph when the gas pedal went down on its own causing the car to accelerate to approximately 85 mph before she was able to disengage the pedal. There was nothing underneath the pedal to cause it to get stuck either time. My wife called the dealership and was told by the general manager, steve, that it was probably the rug stuck under the pedal and the all weather mat should not have been put over the standard mat. These had been installed by the dealer and we explained that the mats were not near the pedal. They finally agreed to come get the vehicle to check it. When the driver came to pick it up, he stated he was told the mats were causing the pedal to get stuck. We told him that was not the case and we didn't think the vehicle was safe to drive. He tested the gas pedal with the vehicle off and said it felt abnormal. It had a click mid way down as well as a click at the very bottom of thy range of the pedal. I also called Infiniti customer support and reported this as well. Case # 18170854 was assigned.