I have a 2014 Rubicon and the automatic transmission seems like it gets stuck when it's going around 50-60 mph and I need to accelerate (like passing). The RPMs get stuck at 4 and the jeep loses power and won't accelerate. To get it to work I have to take my foot off the accelerator, let it lose power, and then I can get it to accelerate. It's been to 2 dealerships and still isn't fixed. Any ideas?