geb724

i have a 2015 ML350. The media interface was working perfectly with my iphone 5s fine until a few days ago. nothing has changed in either the phone or vehicle settings. i cannot advance to the next track while connected to media interface. i can advance tracks connected via bluetooth. i prefer to be connected to media interface. i have left 2 messages with my dealer with no response. i have rebooted phone and no change. any suggestions would be appreciated.