having some trouble with router.

alright this router works fine and everything but everytime i stream a video online it stops my internet but its only a certain type of videos like on you tube everything works fine but when it comes to videos using windows media player it stops it right away. i dont know whats wrong with it ive even tried updating firmware. but im not sure whats going on right now because ive been researching about it but no one seems to have this problem oh yeah my router is a linksys wireless router BEFW11S4 v.4

thank you guys,
et

ok well it doesnt stop completely a message pops up saying connection is limited or something like that but i dont know whats going on i mean after that shows up i cant surf the web or anything.