BrewZilla pump chatter

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NightFlight

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Anyone noticed the BrewZilla recirculation pump start to chatter when the flow is restricted to ~60% flow or below? This only started happening to me after it went through around 6 brews or so. It hasn't failed, but I'm wondering if there is a fix, or if I should look at replacing the pump.

... update. Attached video of the moving magnet impeller structure. Looks like it suffered damage during a period when I had a clog. I opened it to remove the clog, but it possibly damaged the surface affecting the resistive field during rotation?
 

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I lubed the shafts in the motor with Vaseline. Seem to have resolved the chatter until its near %100 restricted flow. Thanks for looking.
 
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