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I had the exact same effect when placing the SICK LMS100 too close to the floor in my robot (the infrared light does not travel in a perfect beam, it becomes wider with distance. So placing it too close to the floor will cause the sensor to be really sensitive to tilt and see the floor. You would be surprised how uneven floors really are). In the video I see the effect happening more often when the robot is moving backwards. That suggests me that it is actually tilting a bit (in my experiments less than 1 degree is enough to produce the effect). The problem was solved by placing the sensor higher in my robot's structure.