 I have 30,000mi. Since about 5,000mi. the transmission sometimes kicks down two gears when lightly applying the brakes. results in a startling heavy thump & deceleration. the throttle has stuck open both on the open highway and in town resulting in scary moments. Had to throw it in neutral and shut the key off then turn the key back on without using the starter, throw it back into drive .  engine started back up like nothing ever happened. Doesn't happen often but when it does WOW!  dealership has no clue to the cause. said no one else has reported that problem. Wish it had outside temp info. other then this, what a great car ! handles like a sports car, gets 31mpg in cruise from a V6 250 hp 