The car makes a loud roaring sound at about 45-50 mph and the dealership says "probably the tires" but doing some research there seems to be a lot of people with similar problems and add to this it randomly downshifts while braking (or maybe it is the brakes) when coming to a stop which would cause the car to lose control on a snow/ice/slippery situation, this happens at a slower speed and only when slowing down at about 10-15 mph. i am not sure what is causing this and there are multiple complaints out on the internet and no real solutions.