It might start out fine, but your connection slowly fails as your router tries to hold on to its connection.
When ever a router starts dieing here (mine last about 8 months) they will start doing stuff like that. One minute everythings fine, then I can only connect to a few sites, then its ok, then nothing. Power cycling, wouldclear it up, some times for weeks, but it always got to the point I just didn't want to mess with it, and I'd get a new router.
I've been told that router (home versions) last about 8-12 months. The more heat that gets to them the quicker they go. I don't know if thats true, but thats about what mine last on an average ( on my 3rd one now). My Dad seems to go through them quicker. His is buried behind the desk under all the wires, so maybe its true.