Some of the breaks are in the exact same spot, the side with the screws, meaning that some cracks may have been formed from the screws being cranked too much at the factory. It doesn't help that the plastic used for the pelvis is the swirly type, though it was thought/said that issues similar to gold plastic syndrome were long gone. Speaking of gold plastic syndrome, one of the fans who reported a broken crotch had this to say about his handling of the figure:
So I can regrettably confirm the breakage issue on his crotch. I noticed this morning that a crack has formed.
Due to the reports of breakage I was even holding my thumb against the crotch anytime I moved the legs to provide counter pressure when I was messing with him. And given that I didn't notice this last night despite watching for it, I'm honestly wondering if the crack didn't form just standing on my table in robot mode overnight.
I think the combination of the metallic swirl in the plastic and its relative thinness just makes it too fragile. And I say this as somebody who's exceedingly careful with his toys; I mean, cripes, I've had a G2 Electro that's survived for over 20 years.
Here is his image followed by the other cases:
Here is the images from the initial report: