Engine & Transmission problems 2018 Kia Optima but Kia says otherwise

What is your question?

Automatic transmission was replaced around 26,000 miles due to a tech saying the sound was coming from the transmission. Transmission was replaced but same sound keeps occurring. New transmission still shifts kinda rough and makes weird whining noise especially from 4th-5th gear. I can feel the hard shifting when driving down the road almost like it is trying to get enough air out directly after the shift but can not get enough out quickly. The shifting causes the car to noticeably jerk most times. It sounds like it is trying to force air out after shifting. It also feels like it is not shifting as quickly as it is supposed to almost as it once to do a smooth shift but struggles to shift smooth. Other than the transmission issues, when turning the car off you can feel the engine shut down with the shaking starting from the engine bay and working its way back through the exhaust past my driver seat. I need help because Kia keeps saying there is no problem.

What makes this problem better or worse?

As the car gets warmer, the symptoms are more noticeable

How long has your 2018 Kia Optima had this problem?

around two months