OP to answer your question, yep, others are experiencing that (including myself). Its totally in the category of "1st world problem" for SURE, but it IS a bit annoying. I usually dont notice it until I am already on the road, and trying to use voice to text to send my wife a text message telling her I am on the way home or something.
At that point, I dont jab at the screen to try to turn it on (the bluetooth symbol is somewhat small on the screen, and I dont like trying to do stuff like that while in motion). I havent tried to see if voice commands can open that menu, though......
I will have to try that.
Anyway, yeah it happens, and no idea why. I suspect it has to do something with bluetooth protocol handshakes between the phone and car, but no idea why it turns off sometimes. It also sometimes has the phone connection turned off too, at least for me.