1. Ensure that the QR code on the charging station is placed correctly and clean. Make sure the machine's camera is unobstructed.
2. Ensure that there are no obstacles in front of the charging station.
3. Ensure that there are no strong light sources or reflections near the charging station that may affect the QR code.
4. Changing the position of the charging station or base station can also cause the machine to fail to return. In such cases,a new mapping is required.