How's your network connection (mobile, wifi, wimax)? YouTube acts up when I'm somewhere with a wonky signal...Other than that, it works just fine on mine. Sometimes also it may just be particular vids. On my computer and laptop at home (both on wifi) I notice certain vids just don't want to cooperate and no matter how many bars I have, whether sitting right next to the wireless router or sitting outside in my driveway, those particular vids will buffer, start, stop, and do all but pass out unconscious! lol.