I have seen several people write that there is a PW4 menu item to disable this and the more specific claim that it was an option in fw v. 5.10.2.
Settings > All Settings > Device options > Advanced Options > Power Saver
But this setting does not appear in my PW4 menu for either 5.10.1.3 or 5.10.2. Possibly because my Kindle is unregistered.
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