OlivawR: Search first if your router is supported by DD-WRT, Open WRT, Tomato etc. If not buy one which can be used with those. At least if the original software is crap you can change it to something better.
Uhm, not well informed about routers, i think that netgear n300 does that, no?
shadowknight2814: I had a similar problem the last couple of days. Flashblock DOES NOT like either the revised Youtube design (where it keeps going to other vidoes constantly) or Firefox 34. If you use Flashblock, disable it and try Youtube agian.
It's definitely the router, i can't even acess youtube from my phone anymore! :\