Software issue, not hardware issue
It looks like this is definitely a software issue and not a hardware issue. I have a 2012 Jeep Wrangler Rubicon. I previously had an iphone 4 (NOT 4S). I had not updated to iOS6, mainly because of the maps debacle. My phone worked perfectly in my vehicle which has Uconnect (bluetooth). As soon as I got the iPhone 5, the streaming audio was choppy, would cut out completely every few minutes. The phone still paired, and phone calls still worked well (as far as I can tell), but the streaming audio, whether from my playlist or Pandora or wherever, all were choppy. Sounded like the old days when a CD would skip. It still played, but annoying as hell. Called Apple, got the whole "backup and restore" response, which I tried and did nothing. So I went down to the Apple retail store, talked with them, they acknowledged there is a "known issue" with the bluetooth on the iPhone 5 and that it would be addressed with an update. I thought maybe they just didn't want to give me a new phone, as my concern was that the bluetooth module in my phone itself may be bad. They said it was not a hardware issue, told me if it was, my bluetooth wouldn't work at all. Not being one to take anyone's word for it, even if they are a "genius", I decided I would purchase a bluetooth portable speaker (wanted one anyway), and that if both the speaker and my vehicle had problems, I was getting a new phone no matter what they said. I purchased the Philips Soundshooter (great little portable speaker BTW), and went home to complete my test. The Soundshooter streamed music flawlessly for over an hour. I even ran in front of it, placed objects in between the phone and the speaker, even put the speaker in a different room than the phone, still no issues. So clearly the bluetooth module in my phone is not bad. What is puzzling is that the Soundshooter is only listed as being BT2.1 version compliant. So I don't get why some of these devices have problems and some don't. It must be a software issue with the devices and the Iphone. I also called Uconnect (Jeep support), they said that officially they don't even show they support the iPhone 5 yet, and acknowledged that they also have been working on a software update that I will eventually have to get from the dealer. So it could be an Apple software issue, a Bluetooth V4 software issue, a Jeep software issue, or a combination of of one or all of these. Hopefully it will come soon, but at least I have the piece of mind that my phone is not defective.