Our 2 x 3 bladed folding Volvo props have done about 1,500 hours each, we replaced about 12 years ago from 2 bladed, and they are fault free. We have not had any damage from ropes (we do not have a rope stripper) but we must have hit the occasional underwater object, primarily branches or bits of hefty kelp trunks (though if we are under engine and suspect underwater issues - we would be travelling slowly).

I'd suspect a duff batch, particularly if others have a similar problem.