Check this thread: http://www.jeepforum.com/forum/f309/...rakes-1468919/
Interestingly enough, the theory is that its caused by cold weather. Has it been real cold in your area lately? We only seem to experience it in very cold weather.
My dealer first said they reproduced it, then kept the car to try and pinpoint the problem. Finally, after three days they gave up. They backtracked on reproducing the problem, saying they only did so under certain ridiculous conditions (4000 rpms - which I rarely get the car to) and what they experienced was "normal".
Interesting to hear that your dealer acknowledged that they are seeing this issue more. My dealer said Chrysler told them they had never heard of it. Ugh.....