I had same (or similar) problem with navigation not announcing exits from highway.
Using TTS, and my app version is Israel 9.18.27.687519
At first I also blamed long silence, but reason was not there.
Found sulution for my problem after about one year of experimenting with everything possible.
Finally, solution was to change in 'Settings -> Sound' option 'Say Road Names in Native Language Area' to 'Just Maneuvres'.
With any other option activated I don't get exit from highway announcement.
So I had to choose between road names and highway exits.
Makes no sense, but it's true.
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