Has anyone had the audio system go dead yet? All of the on screen stuff seemed normal, just no sound from any mode. I scrolled through the settings to see if anything looked wrong, but it all checked out. So I rebooted the system, nothing happened. Then I rebooted it a second time and everything came back to life. I have seen the posts about the navigation screen going blank and needing a reboot (happened to me once but came back by just restarting), maybe the audio suffers a similar problem??? This thing gets a knot in it's shorts pretty easily.