I purchased my 2015 JK new. I am just starting to have this issue with the shifting lately. After driveng for an hour in highway speed,the rpm goes up to almost 3000 while going 100 km/h. I brought the jeep to the dealership but they cannot replicate the problem. however, they said they had to upgrade the TCM, trans control module. It is still doing it. Found a way to deal with it by setting my Cruise Control, this way when I press set or resume RPM goes down to 2100 at 110 km/h speed which I think is normal RPM? Now my cruise control stopped working. i would love to hear from you guys, I am running out of time, I only have 5000 km more before my warranty expires.