Apparently Apple has a problem with bluetooth on iPhone 6 models and the cure will [hopefully] be made when they offer IOS 8.1. There have been many
users who cannot make stable connections with cars like BMW,Jaguar, Mercedes, Toyota, Lexus. Should be sorted fairly soon say Apple.
btw Vodafone sent me a new iPhone 6 and haven't asked for the old one back. I expect a text any day from Vodafone...........
They wiped my last month's bill and 2 hours later I had a text saying I hadn't paid my last bill........