Gradual loss of lower speeds - now only speed 6 and up work
My kitchenaid 220V when purchased used did not work on stir and speed 1. Eventually over time speed 2, all the way to 8 no longer worked. The machine would sometimes give a half effort to turn and then nothing. My friend took apart the whole machine and put it back together and it magically worked again. He didn't exactly know what he did. He said he just cleaned it up and reassembled it.
Fast forward 3 years, and the same thing has happened. Gradually over 2 months stir stopped working, and now only speed 6 and up work (at proper spinning speed).