Sometimes crickets can get a cricket virus and it spreads super fast. It's very important to clean your cricket bin and dispose of any dead crickets daily, however, with the cricket virus... it really doesn't matter. Best bet is to buy from someplace else and see if the same thing happens. If it does, it's probably you and not the crickets. However, make sure your cricket keeper is appropriate for the amount of crickets that you have, the food is appropriate for the amount of crickets you have and their needs and ventilation, temperature is in check. Also, make sure there are no hazardous chemicals in the same room as your crickets, they are very sensitive. Typically, if you get 1000 crickets in bulk, like I do... you would keep them in a big storage tub with a big cutout on the lid with screen in place so that there is ventilation. You can get these big tubs at wal-mart or target (and other places) in the storage section. Feed them ateast repashy bug burger/cricket crack with fresh veggies proven good for gut-loading in prep. to feed chams and a source of hydration. Clean out any dead crickets daily or when needed and once a week I suggest getting a spare tub so you can switch them into the fresh one while you clean the dirty one. If you use bleach or something, make sure you rinse it really well and let it COMPLETELY air dry before attempting to put your crickets back in there... which it should if you've already put them in the fresh tub because you shouldn't have to completely switch it again for a week or so. Hope this helps.