You may want to do the same as me - admitting defeat and looking at replacing the receiver in your car. Going to put one in that supports CarPlay and put this grief to an end. I had sent an e-mail 4 days ago to Tim / executive escalation team regarding their support / downgrading policies and user impact - not a word back. Not going to live with a scenario that I don't have hands free working in my car.
Problem persists in 11.0.3 btw.
Oh...and it's something that Apple / the Carrier are pushing down in their settings after install. 11.0.1 didn't have the problem for hours. Then when I noticed that my health and activity data were back, boom, the problem's back.
(and that's setting up from new, so how do you stop them from pushing this data on you?)
Only solution - replace the receiver with a newer one that works well with Apple.