Management Issues asks the question: Does your desire for change itch, or burn?
Burns go much deeper. They are itches that don't go away. They've been around for a long time (a year or more) and they have wrenched your value system to the point that:
You can no longer compartmentalize work vs. life.
I don't know that burns 'wrench' your value system -- I think it's an incongruency between your values and your firm's values that develop burns in the first place.