We apologize for any inconvenience this may have caused. We sincerely recommend that you follow these steps to check: 1) Check whether the fast charging protocol of your device is compatible with the adaptor. The charging power of different charging protocols can vary, and some devices may use proprietary charging protocols. 2) Check if the USB cable is properly connected or if the USB cable itself is damaged. If the connection is unstable, charging may be intermittent. 3) Check the charging ports of the device or charging cable for any dirt or damage that may cause intermittent charging. 4) If the temperature of the device being charged is too high, the charging speed may be limited. You can try to unplug the device for a short period of time or place it in a cooler environment before reconnecting the adaptor. If the above steps do not resolve the issue, it is recommended to take the device to a service center for inspection.