Have you checked the dust filter?
Please check and clean the dust bin filter.
Note: Using the filter without completely drying it after cleaning may cause errors and will prevent the vacuum operating correctly.
How to clean HEPA (dust) filter
① Remove the dust bin from the main unit.
(Procedures may differ by model.)
② Remove filter. ③ Clean with cleaning brush.
④ Wash with clean water. ⑤ Completely dry in shaded area.