Robovac all of a sudden is very noisy

In March, so just about 6 months ago, I bought a robovac. It’s worked great. Now this past week it’s become extremely loud while it’s running. I’ve changed filters and brushes yet it’s still very noisy! I don’t know what else to do. It’s hard for anyone to concentrate on anything while it’s running. Any suggestions to get it to quiet down?

Do the following test :
Remove the middle brush and keep the Robovac running.
If the noise is gone, you could put some tape on the free wheel of the brush.

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Thanks so much ! That worked great!!!

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Old Franz knows not so much, but sometimes he is able to help.

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