Hi, it's Jack at Dyson.
I'm sorry to hear you're having difficulty with your DC35. If the brush continually rotates when attached to the machine, this sounds like there may be a fault with the main body assembly.
I'm not sure if you've purchased your machine directly from us, but I would encourage you to contact us so we can confirm what may be needed to resolve this situation. You can reach the Dyson Customer Helpline on 0800 298 0298 (UK), 1-866-693-9766 (US), or 1-877-397-6622 (CA).
Best wishes,
Jack
Dyson Online Customer Support
www.dyson.com
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