Ford Focus ZX5 Turns off at Hard Stops

I have a 2005 Ford Focus zx5, which has been a great car for me so far. I live in DC, and traffic is insane. Over the last year or so, maybe once every other month, my car has turned off when I come to a hard stop (usually braking suddenly at a light/pedestrian walkway). This is my first time owning an automatic, and it's just as if my car had stalled out. The radio will stay on, etc, but the engine dies and I have to put it into park and re-start it.

The RPMs have seemed to fluctuate a bit as well, usually on start-up or on hot days.

So far I haven't been motivated enough to get it taken care of, since it happens so infrequently and things seem great otherwise, but I've got some free time coming up and want to make sure I've got an idea of what I'm looking at when I take it in.

Any thoughts on what could be causing this?

Source: http://community.cartalk.com/discussion/2293348/ford-focus-zx5-turns-off-at-hard-stops

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