Have you ever been in this position? You are working for a company and the general work vibe has become negative. Or maybe your peers have become indifferent and are starting to go through the motions. When company morale begins to sink it is usually felt by the staff long before their bosses. It can be months before it is recognized at the leadership levels.
I have been in this situation in the past. A couple of times it was driven by temporary condition brought on by a tough economy, or a big client loss. Those situations tend to right themselves over a period of time. The team can rally and bounce back.