Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 620 Limited Edition died prematurely

I got a 620 Limited Edition mixer for a gift less than 4 years ago. I followed all the instructions, and used it once every week or so to make bread. Small batches, well under the advertised limit.My mixer is now in the process of burning up, and it drips oil and a fine black powder out of the drive for the dough hook into my dough. Gross!Time to give up on KitchenAid and move on to a REAL professional mixer--maybe Viking or Cuisinart.