KitchenAid Professional 600 KP26M1X 575 Watts Stand Mixer

KitchenAid has cornered the market on stand mixers but while they look well made, I have now had 3 motors burn out on me and I use the mixer less than 20 times a year. My first mixer was the Artisan that is fine for cakes, cookies and batters, but it roved unable to handle whole wheat bread dough. I thus traded up to the 600 professional. As this is a 12 quart unit with a 575 watt motor, and claims to be a professional unit, I soon found that trying to do a two loaf (6 cups of flour) mix burned out the motor. I then replaced it with the new KP26M1X and now, after one month of use, I also find this unit unacceptable when attempting to make 2 loafs of bread. Even though I set the speed at #2 as instructions require for bread dough kneading, the unit shuts down after about 3 minutes of kneading the dough. When I checked the manual, this condition is the result of "over heating" and it states that the mixer will come back on in 30 minutes. It is not possible to wait 30 minutes for the mixer to cool down when kneading dough with active yeast. I thus have to finish kneading the dough by hand. To spend $400 on a unit that claims to handle 12 quarts and is the companies top of the line unit, and not be able to knead bread dough without appliance overheating makes this unit unacceptable for the serious baker. I intend to replace this mixer with a Viking mixer that has 900 watts of power for the same price.