I bought my Durango almost a month and I’ve noticed when shifting vehicle into reverse the vehicle will jump and make a loud clunking noise. The brake pedal is fully pressed when shifting. Anyone else have this issue?

Recently, I took my Durango 2013 to the dealership for oil change, after that I started noticing a clunk and bump when the car shifts from transmission gear 2 to 1, especially when I am fully loaded and driving down a hill . Do you guys have this? Should I be concerned? Anything recommended to...