iPhone 5S ios8 bluethooth Mitshibish ASX

Good evening, I have an iPhone 5S and since updating the ios8 my Bluetooth stopped normally work with my Bluetooth kit currently have the 8.1.3 version and what happens is that incoming calls are answered normally, but the calls I do not go to Bluetooth, I have to make the selection manually, but using the Skype application everything works well. My car is a Mitsubishi ASX of 2013, I ask for help I have done everything and it seems that is a firmware problem of the phone.