New Surface pro X dual monitor Issue

Hi Team,
Recently I bought new surface pro X . I found issue that audio is not audiable and Video play back speed more than normal speed when I set up dual monitor to Sony Bravio TV . I approached microsoft team and told me that there is an issue in my device. So I return i bought the same another one but same issue in the new one as well. Does it bug in microsoft Pro X LTE version?
Please help me on this.