I have a recently installed a sony deck into an rv and my wife's iphone 4 plays flawlessly on it. (hers is not JB). It connects with a USB cable. Once connected, you have to control the ipod with the deck, its not an fm transmitter type. My i4 (which is JB) will stop playing after about 20-30 seconds. It usually makes a loud distorded sound right before it stops playing. My phone is on IOS 4.01 as is my wifes phone. any ideas ?