My year old male pinstripe is doing the exact same thing. This past summer it was a scorcher in So Cal. and he was real picky on eating a f/t rat pup once a week. His most recent meal was Sept 1st of this year. I know it's only been a month, but it does get frustrating. I've tried moving him to another place in the rack, f/t mice, smaller prey,etc.....it will happen eventually..