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No, your tizi power adapter is not defective. A small "operating system" runs on the Lightning cable from tizi or Apple, which controls the communication between the device to be charged and the tizi power adapter. This cable should not remain permanently connected to the power adapter if no iPhone or iPad is connected as a consumer. Therefore, always unplug the Lightning cable when you are not charging. If the cable is permanently operated on the power adapter, there is a trick to restart the Lightning cable: connect the end device once, then disconnect it. The Lightning cable will now reset. Then connect it normally for very fast charging.