I am also having issues with my KA rubber-edge paddle, regular padle & dough hook paint flaking off. I've replaced my dough hook with a stainless steel one & the whisk because it turned black & pitted/nasty. I've got black grease too. I make bread 1 to 2 times a week & love using my mixer.
What the heck KA!  You've had the best reputation for mixers & products so where's the QC???
It looks like using the accessories is a bad idea but I can't afford a new stand mixer!