Hi. I just got a '06 159 with the stock radio/CD/usb in glovebox. The mp3s play when a usb stick is inserted, but it seems like they are random, or at least don't advance by album name or folder. I naturally want to be able to play albums in sequence. Is this just how it is, or is there some formatting issue? I must say that this radio is a big improvement over the 156!