I personally believe it's just about the size in which they start to become an adult, kind of like going through puberty stage. I'm not sure if it's something in their reproductive system or what, but I think it causes them to lose their appetite during this process. Also it tends to come in the winter time, so I imagine colder ambients can also be the cause.

Only methods I use is to try and put them on a different substrate. I use newspaper and I try to put them on cypress, and make sure they have an adequate hide and humidity. Then offer a smaller prey item, even a mouse in some cases. There isn't really much else we can do in my opinion. It's a difficult question. I just had a female YB that was one of my most aggressive feeders, she hit 1050 and just stopped...