But even if they interact in the laws of physics. Then why is there no sudden change. No incoherence, or sth truly random like sth coming out of nothing.

I mean, we are not able to observe every detail in the universe, maybe there is some random stuff happening in another galaxy cluster and we are just in the wrong place.

But the chance for this is almost nonexistent.

But so is the chance for this moment to, and its happening.