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sorry for the delay
it is possible that the change was done incorrectly or not filled to the proper level. It could also be that the transmission is starting to wear and develop internal mechanical issues.
one thing you can try is resetting the transmission - ignition fully on with engine off (second click) then push the accelerator pedal to the floor for 2min. this may or may not help. A software update also may or may not help but is an option.
.Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.