Car stereo bluetooth issue topic

Hi,

I bought a G3 one month ago. Everything works OK except the bluetooth connection with my car's stereo.

Phone is working OK but music isn't.

I checked that both phone and music are enabled.
I tried both ART and Dalivk with the stock ROM (kitkat).
I tried to upgrade to Lollipop with no luck.

Is there something I can try to make this work ? (bluetooth driver, kernel upgrade ?)

Thx