The only problem I have with the entune unit occurs when using my ipod. I can expect at least one "freeze" on any given trip when the ipod is connected. Not sure exactly what it is, but at some point there is a guaranteed need to reboot the entire system.
Its a damn shame too, because the ipod (my unit is entune with nav, but no jbl 2014) offers far and away, the best sound quality through the deck, superior to bluetooth.
I wish there was a fix, but I am not holding out much hope. I always hope to get an hour out of the ipod (long drive) before having to reboot. But, once I reboot, it seems good to go.
Seems to be worse if the navigation is running as well.
Mine is a 120gb ipod classic as well.
Using ipod cable into USB port near cupholders.