does you laptop have a wireless G network card? if so that can also be your problem because, wireless N routers are backwards compatible to work with wireless G, and your not gonna gain (speed & coverage) from wireless N unless you have a wireless N network card in your laptop, it will just run at Wireless G standards (slower speeds,less coverage). and like the other guys above said "the wifi signal can drop dramatically when sent through walls" a possible reason why it loses signal on your landing is if you have wireless G enabled laptop. if you do have wireless N enabled laptop, that router must be really rubbish.