Connect to the router wired.
So I have ATT and I am getting a 'Server Not Found' error when I try to visit a website. I have to refresh the page around 4-5 times before it finally loads. I am currently using Firefox. The same thing happens with other browsers. My dad is hooked up to the same router and does not experience this issue. I have tried numerous DNS server IPs and they all do the same thing. I'm currently on Google's. What could be causing this?