Always start out streaming in really, really low quality on the Firestick and gets stuck there despite us having gigabit fiber. Usually have to stop playing, ex

Always start out streaming in really, really low quality on the Firestick and gets stuck there despite us having gigabit fiber. Usually have to stop playing, exit and then go back in again then it works and plays in HD. Never happens on Netflix or Hulu or any other app, just Prime Video.