Right I aint no expert but theres a few things from my experience I can share with you.
Logicaly if you set it up and it works, and you dont change any parameters whilst your using it then logicly it should keep on working.
My guess is that you are using an unsecured network and that other people may be using your connection. So the first step would be getting it secured.
Your getting "little or no connectivity" which to me says that the your laptop can connect to your router but the connection isnt coming through properly.
You have prob spent at least �60 on your router so dont be undetered about ringing them, DEMAND that you speak to somebody who is fluent in english.