I had the same problem with the same keyboard but I thought it was hardware 
related. It  happens relative rare and I hadn't this since a long time (maybe 
because I use a newer vanilla kernel). The easiest work around is to unplug the 
USB keyboard and plug it again.
I am not sure if it is and Xorg problem. Could you recheck it in console 
through switching to it with your ps/2 keyboard when it happens?

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USB keyboard stops working
https://bugs.launchpad.net/bugs/173135
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