If a soft reboot isn't fixing it, you can try resetting the device altogether - maybe something got messed up when the last update installed... this will mean you have to re-download everything onto your kindle, so back everything up so that you can put it back on the device. (it could be that highlighting a lot of stuff page after page runs the battery down - changing what's displayed on the screen is probably the highest drain for the device during normal use - but if that hasn't changed a ton, then as annoying as it is, a reset might be worth trying)
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