Automatic Transmission problems of the 2010 Nissan Maxima

On 3 occassions, when trying to stop the car from a slow speed, the throttle failed to disconnect. I was able to slow the car down from 25 mph to 3mph, but I could not get it to stop until I put it into neutral. When I did that, the engine raced just like it would if you were on the gas and shifted to neutral. I have had the car for 13 months and this did not happen until2 months ago, and has now happened 3 times. Of course, Nissan can't replicate and says there is nothing wrong. Only happened at slow speed and within 5 minutes of starting the car after sitting for several hours. . Weather was above 70 all 3 times.

Purchased a new 2010 Nissan Maxima. This past weekend, 4-3-11 while traveling engine developed a loud sound like metal to metal grinding or loud muffler. Car taken to the dealership to have checked, has been there for 4 days and yesterday we were informed that the transmission needed replaced. Extremely low mileage on this model & no excuse for this transmission to be bad already! it appears there have been other reports of transmissions going bad in the Nissan Maxima, can this be investigated??.

While doing normal driving, on two occasions, one coming down a slight hill and planning to stop at a corner, and once when pulling into my carport, with foot lightly on the brake, I noticed the engine racing at 2000 rpm or so, trying to accelerate. Was able to hold car with footbrake, and, after stopping, problem did not seem to repeat immediately.