If the router carriage is located above the workpiece, never change the direction of movement directly by 180°, but always first change the direction of movement by only 90° to the previous movement to change the inclination of the sealing brushes.
You can then change the movement to the one you originally intended.
The sealing brushes are hard and a sudden change of direction directly by 180° can lift the whole cart!
When the router carriage is locked with a locking lever or locking jig, the router carriage must always first leave the workpiece surface before changing direction by 180°.