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Have you pulled the magnet out to make sure there isn't a snail under there or something like that?
Chipped impeller?
Seems unlikely, but I've seen the wet side cage miss the shaft on installation.
Spinning the square ceramic bearing (super glue it down if so)?
A good vinegar soak and a thin film of silicone grease if all else fails to make a difference, although at that point I'd be surprised if that did much.
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