E40 ultra

My vacuumed makes a weird "airplane" sound. It's new i bought it a month ago. It happened when I choose the option 'vacuum only' once. Please help

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Good morning, thank you for your feedback. New machines go through a running‑in period. More importantly, the vacuum cleaner has four suction levels: Quiet, Standard, Powerful and Super‑Powerful. After you set the suction level, the operating noise will increase as the suction power goes up. Please keep observing the device.
If you confirm that suction power is not the cause, kindly provide us with the exact time when this issue occurs again as well as your device SN number.
Europe: Please share your device with ID: BD929781. Our R&D team will conduct a detailed analysis in the backend to identify the exact root cause.
US: Please share your device with UID: QR033438. Our R&D team will conduct a detailed analysis in the backend to identify the exact root cause.
We look forward to your further updates.

Yeah in the beginning even if I choose the turbo suction it didn't release a 'war siren'. So now I always need to set the lowest and you can still hear that pitched noice coming through.  

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