L20 Ultra making abnormally loud noise

I cleaned the bin, changed the filter, cleaned the brush and sensors. It sounds like the motor is strained. Like a high pitched humming sound.

30 day no questions asked full refund... wish i would have done it...

Well, I got mine just over a year ago.

I came here for help as well. Mine making the same noise. Not suctioning good

Same noise

Have you removed the dust filter bin (from the top) or the brush (underneath) to see if something is stuck in the passages between  them?

Same issue here for the last 3 months. I took the bin apart and cleaned really well with no change.

Same issue L10S Ultra. Cleaned everything really good. Took the mops off, removed the roller, removed the brush and still the same noise. (Can’t run it without the dustbin). Maybe somebody will have an answer