Bluetooth + Google Maps - Music = Bizarre Problems

I've been using Google Maps on my iPhone 6 through my Prius C1's bluetooth for years, and it's 99% reliable. But only if I'm currently playing music from my phone (using the built-in Music app). If I pause the music, all the turn-by-turn directions invariably come through sounding like a shitty quality phone call. The "Talking..." prompt on the car's dash display also appears, so I'm guessing the car thinks I'm making a phone call, even though I'm not.

This wouldn't be that bad, except that every time a direction prompt sounds, the music unpauses for a few seconds, playing through the shitty quality phone mode. This sounds awful, and is the main reason I want to find a solution to this problem. But it's not the only issue.

Strangely enough, if I start a navigation in Google Maps before I get into my car, the bluetooth will treat all the audio coming from my phone, including music, as a shitty quality phone call. The only way to fix it is to shut down the engine and reboot the entire car.

Does anyone know a way to fix this? I've done a little bit of experimentation with Apple Maps, and it seems not to suffer from this problem. But I've been using Google Maps for ages, I'm using to the UI, and I trust it a lot more than Apple Maps. I'd much prefer to continue using Google if at all possible.

 

Sadly, no. And as I've used Apple Maps more, I've discovered some serious issues with it's UI that make me dislike it for most uses. Especially since its night mode, which you can't disable, is virtually illegible when your phone is mounted on your dashboard.

However, something did happen recently that made Google's voice a little easier to hear over my music, but only when I have the car's audio system turned up near max. That "something", though, was that my music is suddenly much lower volume, which is why I needed to turn up the audio system. I don't know why my music is so quiet, but if you can figure out a way to make that happen, it might make Google Maps that much more usable.