The Caller ID unit is connected to MyFoodFast through the USB terminal.
Things to check
It may be that there is an issue with the USB port. Please try the following one by one:
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Restart your terminal
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Inspect the USB port where the Caller ID is plugged into. Check that there is no debris inside (dust/food)
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Check the USB port internal connection is not damaged.
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Try plugging it into another USB port.