buildup
very likely the buildup of calcium carbonate on the magnets or shaft of your pumps. Remove them shaft, magnets and impeller and soak them into pure vinegar for a couple of hours. Rinse them off and they should all work again.
IF you notice calcium carbonate buildup on the outside of the magnet, I would put vinegar into the "hole" that the magnet sits in as well because there maybe buildup inside there as well.
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