Just realized that action videos don't have sound on movies and tv app player of windows 10. Does anybody know how to fix it?

Hi I've just bought Action yesterday and when using I face a buffering issue. I've teste it and they happen in both Youtube and Twitch. My upload speed is almost 1Mbps and this happens. Every five seconds I guess the stream buffer. Decreasing the bitrate didn't had any impact, as the buffering conti...