Sometimes my keyboard becomes unresponsive when using Photoshop CS6, & I have to restart

Since I upgraded to Photoshop CS6, I've found that every once in a while the keyboard becomes unresponsive.  I can't tell whether anything specific that I'm doing triggers it, but I'll be editing an image and will press a shortcut key and find it doesn't work. It doesn't happen when I first open up an image, but usually after I've been working for a while. As far as I can tell (it's pretty random) it seems to happen when I'm using a tool to apply an effect to an image, like this last time it happened when I'd been using the Spot Healing Brush repeatedly on a photograph. (Of course that could be correlation without causality, since I'm a big fan of the Spot Healing Brush and tend to use it quite a bit whenever I'm editing photos). Note that the modifier keys still function, but all of the letter and number keys are unresponsive.
Sometimes - and lately it seems like it happens always, there's a sound associated with the shut off.  It's possible that the times I didn't hear the sound I had my speakers off.  It's a brief clicking noise - and I don't think it's any of the built-in alert sounds on my Mac, since I just listened to all of them and I recall this sound being different - but the sound is definitely coming from my speakers and is not a mechanical sound from the machine.  I have no idea what might be causing this. I saw someone complaining of this a couple of years ago, who thought it might have to do with a Wacom tablet. I own one, but don't always use it, and this happens even when I'm not using it.  The only way I've found to get my keyboard responding again is to shut down Photoshop and restart.
I'm on a Macbook Pro, 2.66 GHz Intel Core i7, with 8GB Ram; I'm on OS X 10.7.4 (not quite ready to upgrade to Mountain Lion).

Okay - it looks like I've solved my own problem after a few hours searching for related problems on the web.  It's not a problem with Photoshop but with Mac OS X.  The default "Universal Access" mouse and trackpad preferences were set to "Press the Option Key five times to turn Mouse Keys On or Off." So when I use a tool that I'm modifying with the option key, and I use it repeatedly five times in a row, I hear the clicking sound that means turn on "Mouse Keys" (and turn off the regular keys). Turn off that option, and the problem is solved!

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