They have fresh new bedding and I freshen their water often (and use a probiotic chick boost). I also check the temp of the brooder as often as possible. I am gone for 7 hours out of the day to go to work and can't be there to keep the temp of the brooder right as the heat of the day changes. Maybe it gets slightly too warm while I'm gone? Or maybe he's just be a lazy sleepy chicken? I wish they could just tell me what they need
Anyways, thanks for the advice. I appreciate it!
Sometimes I can find relatively inexpensive min-max thermometers - you might try setting one in the brooder (where the chicks cannot get into trouble with it) and see, when you get home, what the temps were.