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Mordred is pretty amazing, but she's fiddly, and I can't even blame GSC for that. It's not like the parts are loose, but the interchangeable parts are so numerous and centered around the upper body that you can't help but idly and subconsciously brushing up against them and gradually making them loosen up.
I think the best way to have handled this would've been just to make two separate torsos with the shoulders attached. I guess a format more similar to the Table Museum figures.