2016 Hyundai Azera - Transmission Bumps

bump in transmission when down shifting at 35 an 25 mph

A hard downshift can be the result of a low level of trans fluid.
Have you checked the fluid level?

In any event, since trans fluid should be changed every 3 yrs/30k miles, your car is due for its first fluid change, so it would be a good idea to have that service done at this point.