Chosen Solution

When i move the lever to #8 and #10 the motor shuts off. I normally don’t mix at high speed but it was by chance i moved the lever to those positions and discovered the problem. Any assistance would be great. Thank you.

My theory is when you increase the speed above certain level your mixer will start vibrating, this vibration may trigger the safety feature and that causes the motor to stop, to prove that, you need to set the lever at #7 and shake the mixer, if it stops then my theory is correct. Be careful please !