Form Wash Making loud buzzing noise

Our Form Wash has started making a loud buzzing noise during the wash cycle. When it first started doing this, it was doing it several minutes into the wash cycle, and only once in a while. But now it’s been doing it every single wash cycle and sooner and sooner. Today, it started within a minute into the wash cycle.

I very much doubt there is any obstruction in the tank to cause any kind of jamming of the impeller. I have to stop the wash and then restart it several times in order to complete a full cycle. It seems to be getting worse each time. Anyone have a similar experience with this?

Thanks in advance.

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