Please check the bottom left hand corner of the YouTube video to see if you may have accidentally muted yourself. YouTube remembers the last setting for your volume when you previously watched a YouTube video.
Try refreshing or reloading the page to see if it works, or if you have other too many applications or other video windows open, try closing them. If the issue persists, open up YouTube on another browser and check if you can view other YouTube videos. If you are not able to view other YouTube videos, this means there may be some issues with watching YouTube videos on your machine. If you are able to view other YouTube videos, this may mean that your machine is not able to watch videos that are live streamed.
Try updating the Quality settings on the YouTube controls near the bottom of the content window.
As long as you are signed into your YouTube account while watching the on-demand event content, if you need to pause the video and come back, once you play the video again it will restart from where you left off. There are cases where the video won’t restart from where you left off, like when the video is mostly complete. Clearing your YouTube account watch history will also clear all progress.
