If you try to skip to a different part of the video while it is buffering, Vivaldi and Chrome stop responding. I tested this bug on Chrome with no plugins and the problem persisted. Haven't tried Firefox though.
The process tends to take up the most resources used by the browser. Sometimes - rarely - it fixes itself, but even then it takes a couple of minutes. You have to stop it in Task Manager
Is there a fix? This has been going on for months now and it's incredibly annoying