When you say that you have done factory resets: what procedure did you use, and what did the LED lights and the device do with the reset?
Meanwhile, be aware that no matter what the issue is right now, your device is going to be getting near the end of its battery life soon - perhaps very soon - so it's worth starting to budget for a replacement now. Frontlighting is rather a revelation unless you're always reading outdoors in the daytime, so you'll have some benefits from the upgrade also.
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