Assuming everything is correct when you respond to Gulf's post... You may want to try putting a few crickets into the fridge or freezer for a few min before feeding them to your BD, This will slow them down and your little guy can go to town on them!
I usually put a bunch in the freezer for about 3 min (in a container of course) I pull them out and they seem dead, while in this slumber, I use a pair of feeding tongs and pull off their back legs, then pour them all into a shallow dish. My beardie loves it, he will stand over the dish and eat them as they thaw and start moving again. This keeps the cage clean, and whatever he doesn't eat can stay in over night for him to nibble on in the morning since they can't get out of this dish.
I know this sounds a little mean, but a lot of beardies will get very discouraged when they try to catch a cricket and it gets away, I have even seen some give up on a whole meal because of this.