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The OS will provide (if M$) drivers for the keyboard. On several occasions, I have had hardware stop responding but a reboot will fix it.. I am not sure why, but I suspect the OS looses the drivers in the process of doing other things.. a reboot reloads the drivers. If the anomaly occurs often, it could possibly be a (slight) resource conflict..check device manager. If this continues or gets progressively worse, run a good memtest from a boot disk on your ram modules. A flaky stick of ram can cause all sorts of intermittent glitches.
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