This is driving me nuts and I don't know who to turn to (it can't be a fault with my ISP's wireless router - cos it does work on my phone). Very regularly, my Mac simply won't load anything. It just hangs. No amount of restarting sorts it out - it just sorts itself out at some point (sometimes in minutes, sometimes after a couple of days). Oddly, when connected to the same wifi, my phone never has any problems at all. Does that mean the problem is with my Mac? Even more oddly, when I connect it to my 3 Wifi dongle thing, it all works fine (I'm using that now). I've posted a video here which I hope explains it all. Please help!!