Of course, we can only speculate that things are beginning to wear on him. Who knows what else could be going on. Maybe there's a familial problem or something. Or maybe there's some other reason for his issues of late. Whatever the reason, it sure is sad to see him so disgruntled. His enthusiasm in the field was (to me) what makes his reporting so good (we all remember how overjoyed he was to hear thundersnow, don't we?!). Its almost hard to watch him like this.