There are two possible causes for this:
- A grinding noise is caused when the stainless steel skirt is loose. To fix this just push the stainless skirt up into the guide groove and turn to the right until you hear a click. With the skirt secure, the noise will go away.
- If that didn’t fix it, the grinding noise might also be due to a slightly bent stirring shaft. If this is the case, unscrew the clear plastic end cap on the bottom of the device and gently push the impeller until it is centered.