I connected a new plusnet router to replace my old plusnet two box router. It's in my sons room and connect ion on the old one has been fine. Now I'm at the point of giving up. He gets a great connection but it's dreadful everywhere else, to the point that even in the next room I can no longer connect most of the time as it says I'm not in range and when I do connect it's slow and laggy.
We have raised the router up from floor level. I am not techy so anything in layman's terms would help please.