2012 Hyundai Santa Fe - new trans is acting up

what is wrong with the transmission on these cars. I had my repaired once and its acting up again. I have had troubles from the start when I bought the car. I will never buy a Hyundai again. Also the service is very poor.

The powertrain warranty on this car, which includes the transmission, is for 10 years/100000 miles. Are they not honoring your warranty?