I travel a lot and found on long road trips the battery on the Iphone dies after a couple of hours. So I of course use the USB chord to keep the phone charged. But now the phone locks up overheating. So I disconnect the phone from the USB and stick it in the vent slot for the ac to cool it back down.(fits nicely) Once cool I rehook it back up only to discover upon connecting it that pandora loses volume and I have to go thru the reconnect disconnect game till we get volume again. I am hoping someone has a better answer and can confirm this same problem.