Are there a lot of other devices on the usb ports, maybe the 5 volt line to the usb ports is weak, just maybe. If possible, unhook other usb devices. If possible, take the battery out, and see if it is found then by windows. If you have to solder to do that, maybe better contact the seller for warranty?
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This sort of thing has cropped up before....and it has always been due to human error.
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