Hi,
You may have already done this, but just in case
- Make sure you have the latest firmware installed
- Settings - HOME - Widgets - Music Tab: assign your main music player as the default
- Settings - HOME - Widgets - Navi Tab: assign your main Navi App as the default
I mainly use Spotify/Waze which I have set as defaults, but I also use outside of the defaults for music - CarPlay, DUDU Radio, Nav Radio+ and YouTube, all seem to lower for navigation notifications.
Matt