The noise problem of the motor can be caused by dust entering the motor. Consider not using the machine without a HEPA filter and filter cup. Please do the following check first：
Check whether the dust cup/HEP filter/filter cup, conductive tube, or floor brush, are blocked and clean them up.
Please take out the HEPA filter and the filter cup, shake off the dust and rinse with water, dry, and reuse.
Please restart the machine without any accessories, like filter cup \ HEPA filter, tube, and brush to see whether it works.