Both my wife and I are having an issue where our phones will connect to our vehicles via Bluetooth and immediately the car will think there is a call in progress to 10000000, that we have to forcefully end before normal operation.
I have a Moto Z3 and my wife has a Pixel3. The issue is happening with my Nissan Frontier and my wife's Kia Soul, and it started about a week ago.
The last firmware we go was 2-3 weeks ago so I don't think it is connected to that.
I have also seen other posts online that talked about apps like Skype or Tile being the cause but we don't have those installed.