I'm getting this weird thing with all three browsers on my system where it will let me open a couple of pages, but then everything freezes after a few seconds to a few minutes. Chrome seems to be the most stable, but eventually Safari, Firefox, and Chrome all succumb to a strange freezing issue. I have to force quit the app and reopen the browser, at which point the process starts over again. Other computers and devices work on the network, and other apps (like mail) don't have any trouble connecting to the internet. I've never seen this problem before. Any ideas on where to start troubleshooting?