You're correct its an feature of your device. when using Bluetooth features, especially multiple devices or connections. you can change the settings as to which will use media and calls. it seems like one vehicle is paired to use a specific feature so you are having to manually switch the features. try starting from scratch with the pairing process and set the phone to utilize both features in each vehicle but make sure it isn't connected to multiple devices at once or it'll make the decision for you... hope this helps... ... View more

often when the device is short of memory apps and features become nonresponsive. have you checked your phone's storage system ... View more

I would advise you to use a different password than the Google log in when you do decide to use it ... View more

have you tried to turn it off completely afterwards...it sounds like an interruption during the update process. could have corrupted the device. mine did that...I just let it sit then it restarted and worked fine. ... View more