When you disconnected your device, did you do it through windows explorer's or calibre's "Eject" function or you simply pulled the plug? If the later, have you tried shutting down the device (power button for 3-5 seconds) and bringing it back on and plugging it back in while it is awake (not asleep) ?
All of those are *stupid* but also *standards* troubleshooting steps that often get you out of trouble with readers, but also computers, modems, heck even televisions nowaday.
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