I've damaged a lot of usb micro ports, but luckily never on any of my kobos.
It's real easy to put weight on the usb cable, or worse, yank on it in the wrong direction. I've bent both cables and ports that way; while frequently not immediately fatal, it doesn't help at all.
It's also possible, especially with a worn or abused port, to misalign the cable, which could cause shorts on the pins. That shouldn't be possible, but like I said, with an abused port, it could happen.
It could also be that you have a bad cable. Maybe the tolerances on the cable are a bit off and it isn't fitting as well as it should, which could also allow pin misalignment.
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