My update to this problem is: 1) I've been going around and around with TSC via messaging. They can't really tell me anything useful and are just saying to bring the car in, i.e. can't be handled by mobile service. Well the nearest TSC is 75mins away, so not going unless I'm convinced it is needed. 2) I found I could connect to my iphone hotspot, so, 3) I set up another WiFi AP with a new SSID and the car connects to that.
So now either I live with using an extraneous AP and SSID set up just for the car, or I figure out why the car no longer connects to the old router/SSID. But at least it is working now. If there was a way to clear out all the old SSIDs and passwords, that might help.... Is there?