I have the exact same issue. It is almost as if the window is cracked in the back or something. Unfortunately there is nothing GM can really do about it without making it worse.
When it comes to "Fixing" it, sometimes when I cycle the top the wind noise is less. Sometimes when it rains and top drys it fits tighter with less wind noise. All I can say is, as long as your top doesn't leak, I wouldn't let GM touch it unless they are 100% sure they can fix it.
If it completely bothers you to the point where you must have it fixed, I would take it to a professional shop that specializes in convertibles.
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2018 2SS hot wheels convertible
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