Oh wow, someone finally found something. I love the comments there btw... "SIG IS DONE!" and whatnot lol

When this really looks like a minor tolerance stacking issue at best. Something is causing the slide not to rest properly and allowing movement, which frees up room for the hammer and/or safety. But with SIGs being modular you can easily swap the frame, slide or anything really. So it should be a simple fix they can rollout.