The sun roof MySky pops and cracks loudly almost all the time. The problem is definitely temperature related, as things warm up the roof gets louder. Imagine yourself driving down the road with a fiberglass boat over the top of you and you will get a good idea of what it is like. Sometimes I can hardly hear my radio. Really makes it nice when traveling. Contacted Jeep several times and they have no fix "yet". I now understand why the salesman and the dealership suggested we take the roof panels out for the test drive.