I've grown New Big Dwarf for several years now, can't say I've ever run into that specific problem with the New Big Dwarfs. It's happened to me with other varieties, but never saw a pattern within one variety either. Usually I just leave the caps alone and eventually they've fallen off, and maybe on one occasion I used a toothpick to pry one off. Moistening it as some have suggested, sounds like a good idea though. I'll have to try that the next time it happens.
~Alfredo
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