The button is grey and it won't allow me to hit back.  The button for forward and pause are white and allow actions to occur. When Pandora freezes it plays whatever song is playing I go to my phone and I get an error stating  Pandora isn't working Close App Wait to close app  Are the options it gives me.  During this time I can't access Pandora, open the app or even click next song.  It's completely unresponsive. ... View more