There's no reason Windows (or MacOS) can't buffer a removable device, it's just not the default. If you've changed that default then that could easily be the cause and you might very well have corrupted the device's file system.
If you can't reboot I think it's time to call Amazon's Kindle support. If it's still in warranty they'll replace it. If it's not in warranty and you ask nicely they'll usually offer a significant discount on a replacement.
I'd make sure you deal with their Kindle support people, not their regular support people and I'd definitely do this over the phone if possible. They have really good phone support and pretty frustrating email support.
Barry
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