I've had this problem on a machine, both in Fedora 8 and Fedora 9. Whenever I try to watch streaming video, in pretty much any fashion, the machine almost always (but not always) freezes. By freezes, I mean the current X session freezes, and even if I control-alt to a separate console session, I cannot log in; it just hangs and doesn't let me type.
This usually happens after between 5 minutes and an hour of video.
I can watch DVD, video files without a problem. I also notice bittorrent sometimes causes the problem, but not anywhere near as often.
The machine's running an AM2 motherboard with a dual core AMD 64. The video card is some sort of Nvidia, less than two years old.
Any ideas, or any suggestions on where to get more information? I've been using Linux for quite a while, but honestly, I've never had it freeze up like this, so I'm not sure where to look for a cause.