WiFi Turns Off On My Mid-2011 iMac 21.5-inch Mavericks

Hi everyone,
This has been an off and on problem that recently became pretty much more frequent. Basically, I'll be sitting and working on my mid-2011 21.5-inch iMac running Mavericks (and Mountain Lion before it) and the WiFi will stop working. I have to turn it off and back on again. It happened so infrequently, I didn't bother with it. Since Monday, it goes off and won't come back on and I've switched to my small MacBook Air, which has no problem.
I've tried resetting the network preferences, but it still isn't working and the WiFi turns off again. Pages don't load but it never says 'Offline.' I have a WiFi router from Comcast, a Netgear WN10000. Any help is appreciated!
Thanks,
Heath

I have been having the same issue since the beginning of this week. Very annoying to say the least. I've also taken the same steps, as well as rebooting the router, and the problem persists.
I have a 2013 iMac 27" running Mavericks.

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