Why won't my MBA recognize my external keyboard

Last month I purchased the Apple keyboard w/numeric keypad for my MBA (2012). I am running it through one of the USB ports on my Thunderbolt display.
When I sleep the Air, take it home, and then replug the next morning - the Thunderbold display lights right up (and so does the network connection that is being run through the TB), but the keyboard isn't recognized. I have to reboot the Air and unplug/replug the keyboard in order to have it be recognized.
Posts that I have seen about this have been dated, and people say this was resolved in an earlier OS update (I think 10.6?). However, I have 10.8.4 and have only just started having this problem within the past 2 weeks.
Any advice or links that people can point me to?
Thanks all...

Hi there,
I would recommend taking a look at the article below.
Apple Thunderbolt Display: Image on display intermittently goes dark, USB devices not available after waking from sleep
http://support.apple.com/kb/TS4080
-Griff W.

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