Could you please check if there is anything tangled with the brush, including 2 slots at bottom to install brush and 2 ends of brush.
If nothing is tangled, may we suggest you contact our support via email support@roborock.com with the SN of your robot as attached picture and a video regarding of the noise, so we could look into it.
Dear Customer, sorry for all the inconvenience.
Could you please check if there is anything tangled with the brush, including 2 slots at bottom to install brush and 2 ends of brush.
If nothing is tangled, may we suggest you contact our support via email support@roborock.com with the SN of your robot as attached picture and a video regarding of the noise, so we could look into it.