Need to reload websites regularly using an O2 Wireless Box?

I struggled for some time now since I had my O2 Wireless Box IV as almost anytime I wanted to open a website, it did not want to load at all unless I reloaded it immediately. I looked up the internet for solutions, so changed my IP to fixed, changed my DNS settings and all, nothing helped. One thing I was sure about was that it seemed to be an issue with DNS.