I would say more than likely a faulty transmission. Transmission probably assembled incorrectly. FCA/Dealer should be replacing the vehicle without question sine this bought new off the lot and not something that happened 1000 miles later. But than my transmission leaked fluid the day I drove it off the lot and than it spent 3 weeks in the shop being repaired. Than failed 5000 miles later and the selling dealer abended me and another took over and was great and in getting the issue resoled. Good luck and make sure you are in constant contact with Jeep Customer Service. Don't let up on the dealer or FCA.
Spending time learning the science of the mechanisms of friction, lubrication, and wear of interacting surfaces that are in relative motion
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