[johnc_22]

I've now got my car back in the states (yes!) and this problem persists. I now can nail it down to only appearing after driving in bumper to bumper city traffic for a good amount of time. I've only had the car for a few days and obviously don't want to give it up but will probably be taking it to the dealer sooner rather than later. I don't notice the problem first thing in the morning or driving around at lunch but my slow, crawling afternoon commute makes the problem more prevalent. This is consistent with my experiences in Germany as the problem was really bad after driving through some nasty city traffic in Munich.