What should I do if the built-in USB charger stops working or shuts off?
The unit has a built-in overload and overheat protector that will shut off the charger if the output is overloaded or short-circuited. To reset it, simply unplug the external USB device from the USB port, and the charger will automatically reset. (Page 6)
From the official Craig Cbt3348a manual, page 6
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