I agree with what has already been said about staying on the floor of the cage...this just happens sometimes. I had a male that suddenly decided to rest on the floor for a few days in a row (still went up on his perch at night) and another that decided to perch on the side of his water bowl for a week. I also disagree with keeping your humidity as high as possible, which will likely cause respiratory problems. I try to keep mine around 50%-60%, and spray every other day or so to bring it up to 90% for a few hours. My humidity frequently dips down to 20%-30% in the winter and I've never had any issues. I've talked to quite a few breeders with very large high end collections that rarely, or never, mist. Airflow is one of the biggest things to watch out for, as too little airflow can influence the growth of mold. Your little guy may be going off food to get ready to shed, or maybe for no reason at all. I would wait and try to feed again next week, it is probably nothing serious. Is it an import?