Same issue here. Started with a hard shift from 1 to 2 when it was cold, every once and a while. Then one day, every stop was a hard shift from 1 to 2. This would happen periodically and shutting the car off and turning it back on would solve the problem, until next time. I called Hyundai several times about it and they said that they have to see it. BUT, I could never get anyone on the phone at my local dealership when it was having the problem and reception was telling me everyone was too busy to see me. It was so frustrating that I wrote a letter to corporate. Corporate called me several times, I didn't pick up originally because I thought it was a spam call. They told me they spoke directly to the service manager at my dealership and they were ready and waiting for me to show the issue to them. It took months before the timing was right, as it always seemed to happen after the service center was closed. Finally, a few days ago it was happening in the middle of the day. I headed to the dealership and it quit 2 stop lights before I arrived. It was SO frustrating! So, I drove another 4 miles or so ,stopping and shutting the car off and starting again every 1/4 mile. Eventually, it started doing it again and I hurried back to the dealership. They were attentive and on top of it. Their mechanic came out and got in the car with me. It did the hard shift and he immediately said, "looks like you need a new transmission." He said it could be a temperature sensor, but seems like a news trans is in order. They got me setup with a rental and are working on it now. Like someone else on here said, they have to experience it for themselves. If they're not open to you popping in and showing them, contact corporate. Best of luck everyone!