I have a KitchenAid stand mixer that is less than 10 years old, and has only been used about twice a year, mostly for pizza dough. Today when making some bread dough, the mixer smelled burnt after about 5 min. I shut it off, and small wisps or smoke came out the side. Why is this doing this? I saw online that 10 minutes was the max it should run for heavy dough, and this was only about half that. does my mixer need repair? Any thoughts? Thanks!