In schools (as well as in homes) there’s a tendency to work on the “hot” problem that precipitated a concerning behavior on a particular day. But since unsolved problems wax and wane, the “hot” unsolved problem that was addressed one day or week (but not seen through to a final resolution) is often replaced the next day or week by a different “hot” unsolved problem. However, the first unsolved problem hasn’t gone away; it’s just gone into “hibernation.” Since it’s still unsolved, it keeps coming back.
