Thank you for posting -- mine started doing the same thing about a month ago at about 7,000 miles. It's subtle but not something I want to live with.

It seems to be more noticeable first thing in the morning when the car is cold. I took it to two dealers on three different occasions but was unable to demonstrate the condition after the car warmed up. They test-drove it but could not detect any problem. It was frustrating.

Each time, they told me that it would have to get bad enough for them to know what to fix. It's still not consistent enough for me to demonstrate at will.

Exactly what did your dealer tell you was the problem? I'd like to tell my dealer where to look.