For a while now I have had an issue with wi-fi on my iMac. I thought it was router related but lately I have been testing it against my iPhone. What happens is that at seemingly random but frequent times (can happen 10 times a day) the internet connection drops. I still however stay connected, at full signal, to the wi-fi. It's just that I can't access any web pages at all or any web bases application. Internet usually comes back after a while but can sometimes stay dead for a while. All the while I can access the internet on my iPhone using the wi-fi. One thing I do to fix it straight away, is to turn airport off and on again and it works straight away. Does anyone know what the issue could be? Do I need a new router?