I have not yet installed the latest update (well, i tried but the update failed twice), but I am curious if anyone else has noticed this behavior when receiving and replying to text messages.
When I am using the Navigation and receive a text message, then I ask it read the message, after that, the next direction from the Nav system is spoken aloud even if I had the Nav voice turned off in settings. This has happened to me 2 or 3 times so i am sure of it. When i click on settings to turn off the Nav voice, it is already clicked off (as I thought it was), and I never hear it again. So it is as though the text feature turns on the Nav voice.
What i have not done is to test if it comes back on for the Nav if I receive another txt after checking the settings....seems like it would but I am not sure.