Humans are quite complex. Issues that arise in one area of life can end up affecting other areas, even without us being conscious of it. Something going on at home could affect our performance at work, or something going on at the office may affect our interactions at home. Financial, or physical, or relational stress could end up affecting other seemingly unrelated things.
This is one more reason to deal with issues as they arise. Even if they seem to be disconnected from other areas of life, they can still have an impact, regardless of whether we realize it or not.