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We have the same unit as you do. I had the same problem. If you notice when the windows are up the two sliding levers are suppose to snap into notches in the window frame. You'll notice that the rubber gasket also is notched. The two notches, rubber notch and window frame notch, do not line up. I ended up cutting the rubber gasket so it lined up with the frame notch. That solved the problem.
Not sure why the two notches didn't lined up. Perhaps because the rubber gasket shrunk or slipped out of position?
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