Heh! I was thinking about that all day. I was imagining an atomizer bridge melting or breaking and crossing the contacts/welds or whatever and resulting in significantly less resistance. Maybe just atomizer burnout or melting/failure from a sustained button press.
We got at least 4 failures and I'll bet at least a couple of those people still have the parts or whatever is left. Easy enough to measure the resistance of the atomizer and inspect it. Certainly the Detonator guy has the technical savy and motivation to do that.