The Xiaomi Robot Vacuum S20 fails to reposition due to several reasons:
1. If there are obstacles in the vacuum's path or if the area is cluttered, it will struggle to navigate and reposition itself correctly;
2. If the main unit is moved to an area that has not been cleaned before, the relocation will fail. Please try to ensure that it is moved to an area that has been cleaned before;
3. Someone was standing next to the main unit while it was relocating. Please try not to stand next to the main unit.