I have two Ford Focuses both 2010, both low mileage and both have the same problem shifting!!! Anyone has any idea what's going on???

I purchased a Ford Focus Sedan SE in Aug. 2010. In February of 2011, with a little over 11,000 miles on it the car would barely shift from 2nd to 3rd. The car is an automatic. The car would also idle rough and at times downright stall periodically at stops. No lights or warnings, except when it totally stalled all the dash lights would come on. I took it to the Ford dealer garage and they replaced a leaking front transmission seal. I thought I was good to go until March 2011.