Our bamboo flooring is bowing up a lot. How do we fix this?

Just bought this house in the fall. The flooring is less than thtee years old. Wondering if it is because of the heat of the summer expanding the flooring or what? We tried putting heavy objects like toolbox, etc on it, as that is something we heard might work, but it doesn't stay down. Will it eventually stop doing this? Can we nail it down or when it gets cold again will the nails rip out? What have others tried with bamboo flooring?
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