My KitchenAid Artisan mixer started hesitating on Speed 10 like it's going really fast and then it slows down for 1-2 sec and then goes back to really fast. I was making whipping cream when it happen

Jennifer, when the mixer hesitates does it make a clicking noise at all? I would most likely assume the brushes are the issue but this could also be a sign of a tooth missing on a gear or phase board problems.

On the artisan mixer you will notice what looks like to plastic flat head screws on either side of the mixer head. This is the brush cap that holds the brush in place. If you take a flat head screw driver you can remove the brush cap and the brush will come out (be careful sometimes they can come flying out!). Once you remove the brush check for damage or pitting, the brushes wear over time but should look like this (http://www.mendingshed.com/kitchenaidbrushes.html). When you reinstall the brushes make sure that you line up the tapered/dog eared side to the brush holder in the mixer, you will notice that it is square with a square in one corner, sometimes it helps to shine a flashlight into the brush holder to double check.

If you re-install the brushes and the mixer will not turn on they were not aligned correctly to the brush holder.

If you need the brushes you can order from about link, if they seem fine I would look at the service manual (http://ep.yimg.com/ty/cdn/mendingshed/kitchenaidservicemanual.pdf) the last few pages will have more troubleshooting guides.

Please let me know if you have any questions

-Colleen @ MendingShed

Unplug it and check the carbon brushes under the black screw caps on the sides. BE CAREFUL they only fit properly one way so take note of where the chamfered corner goes. Next check for loose or broken wires under back cover. After that it's going to get tricky.