Looking at this post, the details are not here to begin a good discussion. If you don't share the site that is trouble, others can't look into this.
Sometimes I pause a streaming video while I'm waiting for it to buffer or just when I want to do something else for a second. When I unpause the video, I can't hear anything. I can play audio files on my computer such as videos or music, but the streaming video seems to have lost its audio until I refresh the video. This has been happening frequently. I use Google Chrome and Firefox (it happens on both) and I'm on Windows 7 64 bit.