How long have you had it? If not very long, it could be in the sand for a while. My male bipartitus didn't come out for nearly a month, then only for a few hours one day, then gone for two weeks, then repeat. He finally started coming out full time about two months after getting him. I tried adjusting my light cycle for him to give him some light to hunt when he did come out. If it hasn't been in captivity long, it may still be trying to adjust to the completely different lighting cycle. IMO, tat's it largely what kills them. They sleep while we're awake (when they are in their natural environment-Africa, Vietnam, etc.). If they wake up with lights off because their internal clocks are different than ours, they can't hunt, so they go back to sleep, allowing themselves to slowly starve. Once adjusted, they seem to be relatively hardy. The first three or four weeks of constant activity usually tells the tale.
