hi, i've recently bought a macbook pro and there were no problems when connecting to the internet via wifi. however when i go further away from the router (e.g its downstairs but try to access from upstairs) i get a 'connection timeout' and no internet. the macbook can detect the wifi (it will have a couple bars) but i will not be able to connect to the internet, just a message saying 'connection timeout'. only when relatively close to the router does the internet work fine. is this normal? its pretty inconvenient, any suggestions as to what i can do? thank you