Sounds more like just a reboot if it only took 20 seconds. Not sure what would have happened to make it reboot, but I doubt it was any kind of OTA firmware update for a number of reasons.
Unless its a 3G model, if you had wi-fi off it wouldn't pick up an update.
There have been no updates for the KK in a while. The last update had to be done earlier this year or else your KK would no longer be able to connect to Amazon.
Your software version should be 3.4.2 (Home > Menu > Settings, and the software version should be at the bottom of the screen).
Edit: beaten to it by JimmyR, can't believe it took me 10 minutes to type my post :-D
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