The explanation I got for this is that especially on the Sage with it's very aggressive power management, after a certain delay, the ereader goes to a deep sleep mode. The first key press wakes the ereader up but it will take a while before the ereader is awake enough to process the key press. At that point, I had usually lost patience and hit the key again. So now the second key press is queued up and gets processed as well.
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