A number of small things really. In isolation, none of them would cause much alarm but together I'm getting the feeling that his commitment is waning.
For example, earlier in the season he was berating refs at every dubious decision, now he says almost nothing. Another example is his decisions to play it safe with his passing more frequently, less risk-taking. Add in his contract situation and it just makes me uneasy. I could list a few other things but each of them could probably be excused for another reason fairly easy. It is just my read on it and I hope I am wrong, obviously.