Issue with fan stopping while A/C is on

What is your question?

Lately I've had a problem with my a/c fan cutting out; stopping all blowing and noise completely; for and instant, then starting back up again and working fine. It doesn't happen all the time, and nothing in particular sets it off. I've been driving along, or idling at a stop light and sometimes it'll happen, sometimes it won't. I'm not sure which catagory it falls under so I was wondering if anyone could be of assistance so I don't have the wrong thing repaired...since there are a lot of unscrupulous people here that will tell you all sorts of things are wrong and need to be fixed, when they actually don't. Thanks!