Very hard, loud downshift, from 3rd gear. Hearing the box ‘clunk’ very loudly. Automatic transmission.
If you actually have a 2017 it is still in the warranty period . That means let the dealer look at it and do not do anything that might void the warranty.
Agree, let the dealer handle it if under warranty. There could be a software update to address the shifting concern. Pretty common for them to have updates on the newer multi speed automatics.
No disagreement the best path is to let the dealership solve this. It may not be the transmission however. Could be a driveshaft or rear-end problem. Do you notice anything usual occurring when coming to a stop in D, like at a stoplight? When taking off after being stopped a stoplight? When shifting from D to R?