A bad battery will also cause this. I've seen an issue where the controller in the cell box (it has a serial data to Kindle) was causing the Kindle Keyboard to shut down, even when externally powered. Various resets only cleared a frozen screen.
Cured with a good replacement less than 1 yr old. Oddly the same 10 year old pack is working in a different kindle, but the orange power light and charge icon remains after unplugging a charger till you restart via menu or power button holding. Been reading on that Kindle Keyboard for 3 days on and off without charge and it's now at 50%. Odd.
Trying add additional SW or do an update is madness if the Kindle isn't working for at least 10 minutes.
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