I've been dealing with this issue for a while and can't seem to figure it out. Every so often, sometimes up to every 30 seconds, my WiFi will drop out. I run network diagnostics through the network preferences and it does the usual cycle and it works, sometimes for days, sometimes for just a few minutes. I'm not sure if this is a computer issue or an ISP issue. I'm hoping someone out here can help me resolve this so I stop dropping WiFi.