New ball owner here. My sons 8 (or so) month old ball has been an awesome immediate feeder. He has shed with us twice and looks great. We went from frozen fuzzies to small frozen mice. Has fed on the mice 3 times. This last feeding (last thursday) he is not interested in the food. He goes toward it then shows no further interest and just moves away. We have tried every day for the past 4 days to feed him. He has eaten regardless of his shedding until now. The past two tries (two days ago and yesterday) he opened his mouth as if to yawn but never showed interest in the food. His eyes are a bit bluish but not shedding yet.
We are stumped. Could someone shed some light on what is happening and why he opens his mouth wide with no intention of striking(only whille in the feed box)

Thanks,
Ron