When I go on Youtube

Question

When I go on Youtube at night to look at my favorites the videos are choppy and spin then go back to the video then spin so I can not watch them without interruption. I updated my Adobe Flashplayer last night to 10 and it still does this. Then when I checked this a.m. (early) the videos played fine. It has happened every night this week though that videos I try to watch are interrupted because of (??) buffering (??) (choppy). I get videos fine on cox and cnn. Is this a problem with my computer or is it a problem with the Youtube server and to many people being on at night or during certain times. Has anyone else experienced this problem?