Propeller crash in the air

Hi all,

I'm doing the maiden flights of my new Y6 but I don't know why extrange reason propellers brake in the air.

I know that are cheap propellers with low quality:

http://unmannedtechshop.co.uk/Multi-Rotor/Propellers/10-inch-propellers/Quadcopter-propeller-set

But I didn't expect that after 5 minutes working the propeller can explode like this.

I already broken more than 5 propellers.

This is a little video when it's brake:

https://vimeo.com/49205481

Can be the vibrations of the motor? Or something diferent?

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