This looks like a hardware defect covered by the 1-year limited warranty, assuming you did not mistreat your device like dropping it into a bathtub or running your car over it a few times.
Contact Amazon Kindle support:
- In the United States: 1-866-321-8851
- Outside the United States: 1-206-266-0927
In general, you will need to deliver your Device, postage paid, in
either its original packaging or in equally protective packaging to the
address specified by Customer Service. Before you deliver your Device
for warranty service, it is your responsibility to backup any data,
software, or other materials you may have stored or preserved on your
Device. It is possible that such data, software, or other materials will
be lost or reformatted during service.
Your Kindle will be repaired, replaced, or refunded.
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