Videos (Flash?) Keeps Freezing?

Okay so I recently got a new computer, and the video will freeze every so often -- it can vary from 10 minutes to 30 minutes between freezes, sometimes longer. It just freezes for about 5 - 10 seconds. The sound keeps going, the video is fully buffered, my computer is fully responsive, it's just that the video itself will freeze. The sound doesn't skip, my computer doesn't act funny, the video just freezes. I've updated Adobe Flash Player, so I don't know if that's it. I don't seem to have a problem with games, though I'm not a big gamer. Nothing else freezes, it doesn't happen if I'm typing and the screen itself is fine. Again, just the video box freezes. I can move the mouse, scroll up and down the screen, etc. It's just like someone put an image still in for 5 - 10 seconds, but kept the sound going. What is this, and is there anything I can do to fix it?