I had this issue once. I got in touch with costumer support and they told me to do things like reset it.
What finally worked for me was manually installing a missing update. I think I was still having trouble accessing my kindle so I gave up and let it be. After it finally ran out of battery, I decided to give it one last shot and when I charged it again, it was working perfectly.
I have no idea if that would solve the issue, but you could always try. I haven't had any issues with it since and this was a few years ago.
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