I've seen this problem frequently since the Android Auto update at the start of August: The app will randomly switch from my selected audio app (typically Pandora or Audible) to Amazon Music (without playing anything from Amazon) until I manually reselect my original app AND press play, at which point it will resume where that app left off as though there had been no interruption. I've seen this a dozen times in one hour. I reported this on the Facebook Bolt forum and other users have confirmed the behavior, specifically only seeing it since the last update and only switching to Amazon Music but adding they have seen the swap from other audio apps as well. 2017 Bolt Premier, Samsung Galaxy Note 10