Hi. I updated to 8.1 last week. I have a pioneer avh8800bt head unit with Android auto built in. It was working (almost) perfectly before the update but now when I plug in my phone, the phone displays the usb connection message box and Android auto just hangs (it gives the "please stop and check your phone" message. If you press cancel on the phone's usb menu, it sometimes launches.....but that is rare. Is this something you are aware of? I know Motorola had similar problems with 8.1 and the x4..