i have a big problem with youtube. it stutters like a proper b**** when i try to watch some of Tek Syndicates videos or videos in general. it's not my network since my dad works in our local ISP and i daren't ask him, beacuse he doesn't work with this, and i don't think its my network either beacuse i've got 100mb/ps down and up.
try a vpn
I have been experiencing same sort of thing lately. Now while I haven't figured out why this is happening - Yes, it's not your connection. Try a different player. Like if you were using the html5 one try flash or try in another browser. I'm using chrome as my main (cause of google), but I also use firefox for some developing and oddly enough I just noticed it doesn't have this problem...
TL;TR: try turning it off and turning something else on.