Bluetooth and Nokia CK-100

Hi, Greetings to Apple Community 🙂

I had iPhone 5 for about year and everything worked really good. Now I bought new iPhone 5 and he have some kind of troubles with my Nokia Car Kit CK-100.

So I need to get answer 🙂 When I start engine, Nokia tells me (no display - just voice commands) "Phone connected" next "Music player connected" (as A2DP) and once per 10 times iPhone block bluetooth connection (radio won't play until I turn off A2DP), next 9 times is everything OK. Maybe it wouldn't be so frustrating, ok I don't use too much A2DP. But about 50% of connections (incoming and outcoming) are silent too. I mean when I change source to iPhone connection is ok, but Nokia won't working in both ways (microphone and speakers).

I couldn't realise whats wrong. Somewhere I found tip to reset Connections (Settings -> General -> Reset -> Reset Network Settings) and re-add all Bluetooth connections. But it didn't change anything. Next tip was about Nokia. I disassembly half of cars cockpit to get my Nokia module, connect it to computer and update to newest version. I had to re-add Bluetooth connection but it didn't work either.

Please, help me. I need to send my iPhone to service?