On One Pompino owners...

They've got those opposing bolts like on Shimano hollowtech - and they must have worked loose. I was riding at the time, and thought the cleat was wobbling - went to unclip, and the whole crank came away, still attached to my shoe. Made stopping interesting!

Once re-tightened they never did that again, so I'm chalking it down to experience, rather than an issue with the cranks.

it's the only way to get properly seized ones off, loosen off the bolts and ride it til the cranks fall off.