[Q] Bluetooth issue with Volvo S80 topic

I just got my hands on an HTC M8 but I'm having issues connecting it to my 2007 Volvo S80 through Bluetooth. It connects then disconnects immediately. I've tried to unpair then pair again the devices, restart the phone but nothing seems to be working :(
I've had no issue connecting a M7, Lumia 630 or iphone 4s.

Anyone know how I can solve this?