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I think the issue is that the rear plastic window is just that. PLASTIC. It will behave differently in different climates and conditions.
Most everyone here is aware that often times a 'chop' is a good thing to do to get the window to fold correctly, especially at lower temperatures. Makes sense, as plastic will become more firm when it's cool, and vice, will become more flexible when it's warm.
I think the best thing one can do is be cautious, observe the window's flex when opening the top. Keep the window clean, and avoid exposure to chemicals. Use a reputable product to clean and condition it, and it should last a long time.
The alternate solution is to replace the top with a glass rear window top. Remember that your top WILL wear out. One CAN get a LONG service life out of it if it's well cared for, but eventually, it will likely have to be replaced.
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