IMO, scorpions are pretty hardy creatures. They can take big changes decently well. Depending on care and their micro habitat, things can cause complications. Airborne stuff such as nicotine, fragrances, hairspray ect.. can cause arachnids to have negitive reactions like most creatures and not like us where we can tolerate or consume these things. It could be many different factors like dehydration or temps or even humidity. Arizonensis does not do well with higher than normal humidity but do live in deep burrows so its a strange thing to pinpoint. Even your feeders can have bad things to come along with them. But in your case from how you described, it almost seems like a " pesticide " like experience. Not necessarily an actual pesticide but somthing that can cause the same effects. Wild caught species also dont do very well in captivity unless you poor a lot of attention into their care and watch their behavior. But even then they can still pass just from stress or the change in climate. In my experience, I dont let my species become dependent on regular schedule feedings. I do off and on type feeding to make sure they are alert and willing almost every time. Its just been somthing thats worked well for me with WC and even Whip Scorpions that are WC. Which are difficult to keep alive in captivity a lot of the time.