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A wall charger is the desired device.
When computers 'go to sleep' they often also turn off the power to their USB ports.
So the device just might not have gotten re-charged.
There are some internal failures that the device can 'fix' (recover from) itself during start up.
But they can take days (although you should see the screen change from time to time).
So go for the full 24 hours on a wall charger.
(If it is self-repairing, it will need the constant power.)
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