Windshield whistling noise wont go away

The gaskets seem to shrink (the rubber gasket around the glass) and sometimes the windshield can move a bit (mine did) since it just sits in the gasket... One company the bottom channel on the windshield is a "U"" or "J" shaped so it holds the bottom better, Others it's L shaped and the windshield may tend to move down a bit exposing the upper corners or the lower corners

I wound up straping mine in with cargo straps (USE caution do not scratch the glass with teh ratchet) and sealing the openings with sealant.