I keep getting DNS errors when trying to use the internet on an iMac on my network. The DNS errors sort of come and go. RIght now it's fine, but 5 minutes ago it wasn't. It keeps happening. Now that I think of it, this iMac sometimes also has issues connecting to the internet. One second it's working, then suddenly browsing the internet just times out. Again, every other computer on the network would work fine though. I'm behind a wrouter that's connected to a modem. How can I begin to figure out what's the issue? Thanks in advance.