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That is an issue with the main wash motor impeller. The impeller would go bad or start to rub the side housing causing that buzzing noise the whole cycle. You need to have the main wash motor replaced to correct that issue. Bosch had some issues with them and it does happen often. Here is a link to the part you need to fix it...CLICK HERE, that unit however is older than you think around 8-10 years old by that model....however it is a very good unit and I would fix it.
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