I once read in a forum that a certain ROM of a RadioNavi causes problems with the voice output, maybe that is the cause 🤔
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[OT]
I have a similar problem with my smartphone Redmi Note9 since upgrading to And.13.
But it's not a problem for me, because I always take a quick look at the display when an announcement is made and know what was actually said 🙂
I come from a time when the only sound output was a bing 🙂
[/OT]