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:
Step 1:
Check whether the dust cup/HEP filter/filter cup, conductive tube, or floor brush, are blocked and clean them up.
Step 2:
Please take out the HEPA filter and the filter cup, shake off the dust and rinse with water, dry, and reuse.
Step 3:
Please restart the machine without any accessories, like filter cup \ HEPA filter, tube, and brush to see whether it works.