The speed is changing without moving the dial.

Check to make sure that you have not accidentally turned on the motion detector mode if you do not usually use it. Refer to your manual to see how motion detection mode works and how to turn it on and off. If it is not motion detection mode, check your motor brushes. These can wear out over time and need to be replaced. You can purchase replacements through Go to Belts, Brushes, Pulleys and find the correct model number for your motor.

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