Button frustrated by power loss

McLaren's Jenson Button says he is unsure as to what caused a power failure at the end of Q3 which meant he was unable to put in a final flying lap in Monaco.

Button qualified ninth and says he was confident of picking up a place higher up on the grid as he was enjoying driving in the mixed conditions.

The 2009 world champion feels his team are their own "worst enemy" at times, getting everything right until the "crucial" moment.

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