In this case, the robot is having problems recognizing the base.
Please position the base in a larger space or in a different place completely.
If it is directly under furniture, heaters, or against black or dark-colored walls, it’s possible that the robot won’t be able to “see” the base. Potentially, strong direct sunlight can also have the same effect.
If the base is not attached to the power supply, the robot will travel until just in front of the base, but then not dock with it.
If you have picked up or disentangled the robot vacuum cleaner during cleaning, this can also cause it to stop short of the base.