Internet Problem

Hi guys,

I have been having some problems with my internet recently. It cuts in and out randomly, and has been going very slow. It started when I was out of the country and connected with an ethernet to a hotel's internet. But I came back home and while using airport to connect the internet has been cutting in and out, all while I show full bars! Firefox's window says I cannot connect because the server is not found, and safari says it is unable to load the page. When I click network diagnostics on safari, it says I am not connected to the internet. I start reloading the pages, and after a few clicks of the reload button, the page loads. Any solutions?