Is It a Memory Problem or ???

This problem occurs when the video playback rate is faster than your Internet connection. To make watching a video possible the player fills a buffer and plays it until it empties. It then pauses until the Internet connection can refill the buffer. Normally the only solution is a faster Internet connection. It is also usually possible to pause the playback until the video is completely downloaded. Of course this may take some time.

I have a relatively slow Internet connection and see this most of the time.