This sometimes happens when a reptile was secure somewhere for a while then gets moved. HL's also sometimes tire of a certain insect that is offered too aboundantly without more variety. I sometimes go through this and have to buy mealworms or catch more moths. They usually move through it after a couple of days and get back to ants and crickets. I try to keep a little of everything around and try new things when I can. I sometimes have similar trouble with the box turtles.

This was also addressed in more detail under the "eating habits" post below.
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"A man that should call everything by it's right name, would hardly pass the streets without being knocked down as a common enemy." The Complete Works of George Savile, First Marquess of Halifax 1912,246