The occurrence of the delamination is random. I purchased my '17 convertible Feb '19 (new as it was a leftover, but that's another story).
I noticed the delamination Jun '19 had the top replaced. Fast forward 4 1/2 months, Nov '19, and had delamination on the new/replacement top (see posts on page 7 of this thread). Top was replaced a second time; knock on wood, 2 years & 9 months later it's holding up.
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