Try this, its an answer I had for a similar problem with my unit.
first, access to GPS console, tap anywhere on the screen. There will be a yellow lock showing on the left corner.
Second, tap that lock, and you will be able to see a set of floating buttons showing at the bottom of the screen.
Third, tap GPS key, and change it from yellow to blue. and tap Radio on the right.
Then you can enjoy radio while navigating.
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