something nobody expected. More commonly, problems happen when management or key team members change and personality clashes result.
Managers need to realize that issues involving pay, benefits, and perks aren't usually the central reasons why good employees fly the corporate coop -- although those factors certainly are not to be discounted. They are indeed important. Most of the time, however, other reasons are to blame for good people going away, including lack of a supportive work environment, knowledgeable management, and good training opportunities.