i have bought 36 barred rock 4 died and a few have been hurt but i not sure whats going on like they were fine and then all of a sudden some of then couldent even walk and i am kinda worried about what might happen next like if one after the other are will not be alble to walk if you have any info about whats happening can you please help me out all they do is lay in front of the food and water (if i pick it up and then set it down it will not move)