Watch 4.0 doesn’t pair

Hi folks , I have an issue when I have upgraded watchOS 4.0. I’m using series of 2 of AppleWatch and 6s. I’m describe of Issue the below; Consist of 3 Issue; 1) Since I play to song that AppleMusic on iPhone, and if someone call me and I receive on AppleWatch, the song cannnot stop automatically. It means, both of voice has mixed at the same time, so I have to do close calling. 2) While I create some list on AppleMusic, it doesn’t assign to AppleWatch. On Watch looks “ No Music”. But I have controlled iPhone Watch Application, there was look good. 3) I cannnot play any song which is AppleMusic to belong Watch. There is some message about “ to play music, pair your Apple Watch with Bluetooth headphone “ so it avoids to play song. I controlled above which is previous version of Watch for healthy. Thanks.