Noise level

its possible that you got a lemon off the factory line or they forgot to put grease into the transmission case.is there a warranty on it?if so take it back.i work for hobart which sold kitchen aid some years ago,if that mixer is less than a year old as stated,take it back or verbally speak to a kitchen aid rep. and tell them your situation.i really belive you should be able to get a replacement as long as you havent overloaded the unit or caused damage.let me know.