For the past several days YouTube videos have been randomly stopping 10-30 seconds before the end of the actual video. By stopping, I mean it hits a spot 10-30 with 10-30 seconds of video left and just jumps to the end. If I drag the slider back to a point just before it stopped, it will stop at that exact point again. I have to find the exact time it stops and drag the slider 1 second past that point to see the end of the video.

I saw Ant's post below about HTML5, but I just checked and it's using flash. I enabled HTML5, so maybe that will fix it maybe it wont. I remember this happening before and I don't remember if I did anything to fix it or if it just went away on its own.