If there is no obvious reason for this, such as the base station having been moved, this is due to a navigation problem. This occurs when the robot's wheels on one or both sides turn without covering any ground, for example if they have got stuck on a high-pile carpet on in front of an object (for example, a clothes horse/rocking chair) and the wheels are still turning. This is similar to when a step counter designed to show a route counts steps without going anywhere – it leads to problems with navigation. The same problem arises if the robot is moved by more than 30cm during a cleaning program.
Why is my robot sitting still in front of the base station instead of docking?
