We use this expression frequently, mainly when we achieve that all-too-rare sense of calm, the astounding realisation that actually we seem to be on an even keel (with any or all of the children) and "wiggling the wires" is the one thing you don't want to do. It's geek speak, but let's face it, coming from our family that's really not surprising. The circuit works, so don't. touch. anything.
But sometimes, the very formulation of that thought, the recognition that there is such a thing as a status quo can be enough to rock the boat. You sit in a review appointment and utter those fateful words:-
"It does seem that things are quite stable at the moment..."and it all falls apart. Spectacularly.