They need nurturing and guidance. The need to contain the right mix of personalities and skills. They need clear direction and a definitive sense of purpose. The members need to be given time to get to know one another. When teams fail, the causes are almost always traceable to the beginning of their existence.
Failure becomes predictable.
Learn how to avoid it. Charter a team. Set team ground rules. Identify the team's boundaries of authority. Design a 90 day action plan to move your team's development into high gear.