Reluctor rings broken front end ABS system ligt on on 2005 Mercury Mariner

Has anyone heard of both reluctor rings being broken ? This seems to be a piece of crap set-up for ABS sensors. I had a repair tech rerplace on of the sensors that he claimed was bad $250.00 and light comes on & off. Pulled front wheels and discovered BOTH reluctor rings cracked and spinning freely. This looks like a common problem. Anyone else experienced this ?

Asked by for the 2005 Mercury Mariner
Had a couple on chevy lumina. Just cracked but not spinning....