Wierd issue with video streaming.

So, I've figured a workaround for this, but it's still a weird problem I'd like to find out about:

For the last 6 months or so, the only way I've been able to stream video (From You Tube, for example, though it happens at any site I use) I have to continuously move the mouse over the video or it will stop playing(But I still hear the sound for a few minutes as if it's still playing, but not moving the picture, then that stops too.)

Now normally, I would have assumed thi...