Hi there, it's Jack at Dyson.
From what you've described, it sounds as if you may be using your DC59 set to Boost mode. This will provide 6 minutes of highest suction for really stubborn dirt, but for regular vacuuming normal mode should work effectively.
To switch back to normal mode, ensure your machine is fully charged (this will take a maximum of 3.5 hours), then hold down the on/off trigger, and at the same time, press the illuminated Boost button on the rear of the machine.
You might also find our Getting started guide useful:
I'm confident this will resolve the issue, but if you would like some further advice from our experts after giving this a try, please give us a call on 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).
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