This is the second time this has happened. I threw about 2 dozen large crickets in my beardies encloser. First time he ate about 15 and I left the rest in their overnight so he can eat them first thing. The next morning all the crickets were dead. Today I put the same amount in, he ate 15 again and 7 hours later there is only 2 survivors, I saw a couple twitching. What is going on???