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For 5 Years!
I would have a representative from the company that makes the windows come out and see if the windows are installed properly or see if there is a defect in the windows.
I had a customer call me back once after I sided new house that had a leak around the windows. We used a hose and wet down all around the siding and nothing happened, then we aimed the hose around the edge of the windows and in came the water.
It seems that on both sides of the window sashes they forgot to plug some holes at the sill.
either way, I would have the windows replaced.