iPhone 6 running iOS 9.2 and a GMC vehicle. Whenever I disconnect from a call using my vehicles bluetooth, bluetooth tries to start an the last unopened music app that I used. The only 2 that I would use are SiriusXM or the Apple music app. When I hang up the previous radio station doesn't start up. The apps are closed. I believe this has started since installing 9.2. Problem that has always existed is if I am scanning radio source and pass bluetooth, BT would still pick up previously closed app. Is this an iOS issue or with vehicle bluetooth?