A number of clips I watch on YouTube keep pausing for a few seconds. Clive Gorst
YouTube and other streaming videos should play smoothly if your internet connection downloads the video data faster than it is displayed. If the replay stutters, hit the pause button for a few seconds until more of the video has been downloaded -- on YouTube, until the red download line is ahead of the black circle that shows where you are. Alternatively, you can let the whole video download before you watch it, or download it separately via a site such as KeepVid (keepvid.com). However, some (a very few) broadband routers have known problems with buffering, and if this is the case, you'll need a firmware update.