When trying to play back music from my iPhone 5S via the USB (not bluetooth) I can't seem to get to play a song. I've had the same phone since I bought the car, and had no problems. But now It reads my artists, songs, albums, etc, from my iPhone - allows me to pic an artist or an album..but when I get down to the song (when I click it) - it does nothing. The song does not play. I haven't done anything in the settings, or my iPhone - no new software - it just all of a sudden won't play the song I pick. When I tried it on an old iPhone 5 (not an S - and with no SIM card) - it picks and plays the song - no problem. I took it to the dealer, and they tried an old iPod (worked fine) and someone's iPhone 6 (which didn't work). Strange