I just wanted to say Im sorry for you its always tough when you have an animal with mysterious symptoms. Anyone who is in this hobby long enough will experience it at some point. I wonder if its not just old age setting in. Ive heard that elderly males will sometimes get stuck upside down and go catatonic as well as go off feeding. Your temps seem reasonable. I just hope it isnt something crazy like lyme disease or spotted fever. Our native american environment can be pretty rough on exotic reptiles. Good luck.
Jason
GPZO