bluetooth problems 2014

I have a 2014 Mercedes-Benz ML350. I have had every generation of Iphone without and issues. I purchased the Iphone 6 and have had many bluetooth problem with connecting to my vehicle. First off it would not connect at all. I did finally get it to connect but would drop connection when someone would call. Also, the phone does not download my contact to the vehicle like it did in the past. Please Apple get this problem fixed. Thanks