Robot vacuum occasionally fails to detect stairs and approaches edges too closely, causing concern for falls.

Safety first: Always supervise the robot near stairs until you are confident the sensors are working correctly.

• 1. Clean cliff sensors: Wipe all underside cliff sensor windows with a soft, dry cloth.
• 2. Improve contrast: If your floor near stairs is very dark or patterned, consider adding a contrasting strip (e.g., light-colored tape) before the edge to help sensors detect the drop.
• 3. Reduce direct sunlight: Avoid running the robot when strong sunlight hits the stair edge, as this can interfere with IR sensors.
• If the robot still approaches edges unsafely, discontinue use near stairs and have the cliff sensor modules tested and replaced if necessary.