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I have the same color combo and year without the hardtop. These windshields are known to crack and are called the "bubble of trouble." In fact, I'm in the process of having one made for me because you couldn't see through my old one. I believe these windshields crack because of the complex curve and the fact that either people, rest their hands on the frame when they get in and out of the boat or the stress of where the hardtop and softop connect to the frame cause the stress. It always seems to be in one or the other corner.
I had a crack and to stop it, I was told to drill a tiny hole at the very end of the crack so that it stops the traveling. You could also try some kind of liquid cement from a place like tap plastics to try and fuse it back to together. I did try that on a test piece and decided it was too messy and hard for me to do, so I just did the drill hole.
When they took my windshield out of the frame to try and make a mold, it pretty much kept shattering in pieces. If your boat is outdoors and you are experiencing freezing and hot temperatures, it was probably enough to grow a crack you probably didn't see or notice because it was inset into the frame.
Hope this helps!
Sincerely,
David