Ok, I figured out now, how to reproduce the connection problems:
The problem is, that the interaction between phone and carkit breaks. It breaks, when you e.g. try to initiate or receive a call via carkit, before the media connection is established. My carkit (Renault Scenic III “My_Radiosat”) only establishes a media connection, when you select the External Media Mode (There are 3 modes “Radio”, “CD” and “External Media”, latter stands for USB or Bluetooth).
So the following situation works fine and more reliable than on previous versions of SFOS:
- BT is turned on on the phone
- start carkit in media mode
- wait till both connections (phone and media) are established
- make a phone call, play music, etc. everything works fine
This scenario won’t work:
- BT is turned on on the phone
- start carkit in radio mode
- wait till phone connection is established
- make a phone call… the phone won’t react
- even if you establish media connection now, the audio stream may get routed to car speakers, but you can’t skip songs, play/pause, etc. also phone connection won’t recover