Problems while watching Youtube videos
I get this problem once in a while, while using the HTML5 player on Youtube. Haven't tested it with Flash, since I get the message that the Flash player is too old all the time. The browser just stops by itself and closes, while you still can hear the video playing on the speakers. There's still a lot of instances of Vivaldi.exe in Processes window in Task Manager after the browser closed. I have to stop the correct instance of Vivaldi.exe to stop the video sound playing. This has also happened on occasion when closing the browser while a video is playing. I have experienced this in version 18.104.22.168 and the version released before that one. Haven't tested earlier versions.
Would you say that's anything like the problem described in this thread?
I'd otherwise recommend installing this extension to disable the HTML5 player on Youtube to see if that helps.