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When this sort of thing is intermittent, it is often a hardware issue. There are a few possibilities. The USB port on your reader may have developed problems with the internal connections. Your USB cable may have "issues". The port on your computer may be wonky.
You can rule out the last two by trying another cable or a different computer port on your usual machine. Be sure to try using the ports on the back of the computer. You can also see if your Kobo is recognized on an entirely different computer (with a new cable or the same one).
If things are the same regardless of cable, port, or computer, then it is likely the reader itself.
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