bugfix streams continuing to run in the background (#1714)

ui/component/viewers/videoViewer/internal/videojs.jsx

@@ -604,6 +604,9 @@ export default React.memo<Props>(function VideoJs(props: Props) {
 
         window.player.currentTime(0);
 
+        // stop streams running in background
+        window.player.loadTech_('html5', null);
+
         window.player.claimSrcVhs = null;
       }
     };