@TeamYouTube Please, why don't I have a sound anymore when watch some videos on computer - Android mobile phone is ok. Like this one https://www.youtube.com/edit?o=U&video_id=myNiLcQXFeU …
We'd like to help. Have you tried clearing the browser's cache & cookies to see if that fixes the issue? Here's how: https://goo.gl/e2dYZt . Also, try using a different browser or Incognito mode to check if that makes any difference.