To resolve the issue, try the below:
1) Ensure that 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) Ensure that the USB cable is properly connected and that the USB cable isn't damaged. If the connection is unstable, charging may be intermittent.
3) Ensure that the charging ports of the device and the charging cable are free from dirt and 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 and then reconnect the adaptor.
5) If using multiple ports simultaneously, the charging power for each individual port is reduced. For instance, the maximum power for the USB A port is 10W when all three charging ports are being used. To achieve higher charging power, disconnect devices that are already fully charged.
If the issue remains unresolved, we recommend taking your device to a service center for inspection.