Brush bar starts then stops repeatedly during use.

Safety first: Remove the battery and detach the nozzle.

• Deep clean brush bar: Remove all hair and debris from the brush bar, end caps, and bearing areas. Ensure the bar spins freely.
• Check for heat: After a short run, feel the nozzle housing (battery removed). Excessive heat suggests motor overload.
• Inspect contacts: Clean the electrical contacts between the nozzle and extension pipe with a dry cloth.
• Test on low-pile surface: Try the brush on a smooth floor or low-pile carpet. If it still cycles on and off, the brush motor is likely failing and the nozzle should be replaced.