My advice is to ignore everyone and just ride it out. Short of taking a bird to the vet for a necropsy, it's impossible to diagnose why they're dying, just by a description. If you try a bunch of home remedies, you may make the problem worse. I'm having a horrible season also. I've lost about 20 of my original 80 birds- I've NEVER had losses like this. So rest assured, it isn't normal- don't give up on Cornish X's yet. Some hatcheries are better than others with making this right. I called Townline and they told me that my birds probably had Cocci, and the guy talked to me like I was crazy for not medicating my birds. After I answered all of his questions, he said that lack of medicated feed/water was probably causing the problem. I asked him how it would be possible for my birds to get Cocci in a clean indoor brooder, with only HIS birds, in the first two weeks of life, when my only other birds (some layers and turkeys,) were purchased from HIS hatchery and are doing fine. He had no answer. I'm very disappointed in Townline Hatchery right now. I called when I only had 15 dead, and I would have been happy with 15 more at half price, but they said no. I told them these birds were different, that I was experienced in raising broilers, and I had always been happy with their birds in the past. Apparently they'd rather make a customer who buys a couple hundred birds per year unhappy, as opposed to taking a $12 loss on a few half price replacement chicks. I was surprised, considering McMurray gave me a full credit on the 6 birds I lost TOTAL my first year raising broilers, which means it was probably my fault!