My 2019 GC SXT is getting the transmission rebuilt because of reverse slippage at only 102k! Codes are P0736 and P0792. There were broken pieces of something in the pan. What would cause this with relatively low miles? and how can I avoid it happening again? Obviously no one knows my driving habits, but I do not drive that rough. I have a medical delivery route doing up to 75 deliveries a day to people's homes. Perhaps park in less driveways, less backing? If anyone has a clue, I'd appreciate it.