If you have plaster walls in the house the mesh behind the plaster works effectively as a signal blocker, the further away you are the worse your signal will be. No matter how your house is constructed it is not surprising that you have some issues with packet loss the further away you are from the router. I have never noticed any specific issues with hubpages on my iPhone and I have viewed it quite a bit, even from 3G with no errors.
Another thing to consider is what other devices are using your wifi, printers, phones, computers, vonage - magic jack...your neighbors?
Hope this helps,