I have been told that during this season they slow down in eating. My cham is also on strike against crix. He will not touch em. I hate it cause I have to catch the crix before the lights go out, I try not to leave any in the cage overnight, as a friend of mines cham got an infection from cricket bites on its skin and passed.
I am sure a more experienced member will confirm the drop in appetite during the winter season as being normal.