Hi, recently set up my WiiM Pro via optical to my AVR. I’m having an issue with the volume level almost being inaudible when casting from the Amazon App directly. Alexa and WiiM app work fine when playing music from Amazon, Spotify app works fine too. I have WiiM set to output at fixed volume at 2 vrms. Streaming quality is set to HD/UltraHD in Amazon app, app version 18.104.22.168479 on iOS. Please advise!