Might be a dirty contact in the Kindle’s USB port. There is a solvent that can help with that. Or the USB cable could have a problem, try a different one. I had a similar issue with my KK not charging fully when other Kindles would, but now it works fine, or maybe the marginal cable is not in use any more.
On the computer side sometimes USB port goes out. If you have a thumb drive, plug that in and see if it mounts up. Or else try a different USB port (Direct on computer, not some Hub or monitor USB port).
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