When your business is trending new of late, re-assessment may not be enough of a solution. If the changes in your market share have been more drastic, then it is likely a re-organization is required.
Some indicators of a needed re-organization are:
1) That your most important decision processes are too vague or too complicated, and waste more resources than they produce.
2) Changes to important personnel either dilute the energy of the company or alter the rhythm of business standards.
3) Competition has become stronger from new sources or a new business model has been adopted by a chief competitor.
4) For three consecutive quarters there has been diminished financial returns. At such a point, some drastic moves are needed instead of the piece-by-piece adjustments you had made previously.
Re-organizations should be implemented methodically and with a positive tone. Despite any panic you may feel, the message and the way it is delivered to your staff must be from the mindset of building and improving.