I would venture a guess at it being the crickets. Try moving them to a different room, out of the way and see if it makes a difference.
Also, if you're using calci-sand, there's a lot of threads on that particular substrate. Erm, lets just say it's not a favourite on here as it can be quite dangerous for your dragons. Have a search on this site for it (mostly the lizard section) and then see if you still feel the same way