I have a new 2021 5075e. I have a 12-speed transmission with the power reverser. At about 80 hours, I was backing into the shed empty when I heard a loud crack from inside the rear of the tractor. Ever since then, my clutch jerks. It is very hard to ease out on the clutch. The power reverser is still smooth though. I took it to my dealer and they returned it, but it's not better. Any suggestions as to what it might be?