Minh,
When you say always how frequently is it happening to you. My sound cuts out probably about once ever 2 hour drive I take to our other location. Shorter drives it never cuts out at all. I'm running the latest Pivi software though. It was worse when I was on earlier versions. I would suggest you turn off all notifications you would get in CarPlay or Android Auto, I think that has something to do with it.
When you say always how frequently is it happening to you. My sound cuts out probably about once ever 2 hour drive I take to our other location. Shorter drives it never cuts out at all. I'm running the latest Pivi software though. It was worse when I was on earlier versions. I would suggest you turn off all notifications you would get in CarPlay or Android Auto, I think that has something to do with it.