You should buy rep-cal and dust the feeders with it before feeding to your beardie. I usually put the crickets in a ziplock bag, for example, dump in a little bit of calcium, shake 'em around, and voila, dinner is served! That's usually done at least 5 times a week. Additionally, you need to get a multivitamin dust and dust with that at least 2 times a week, I would suggest.
The calcium prevents beardies from getting Metabollic Bone Disease (MBD), which can lead to paralysis.