I will add to this post as well. I am new to making woodies, and I made up my first dozen about a month ago.
Well after an arrow was shot about 40 times they started blowing up on me! I had about 4-5 out of the dozen do this within the same week. I aligned the nocks correctly and they were splitting as if the string was a band saw, all the way to about 8 inches down the shaft.
After a couple conversations with 3R specialists, and my local trad archery shop, we came to the conclusion it was the nocks. I was using Bohning T-nocks with Fletch-tite platinum to glue them on.
After a few "experiments" of sorts, I determined that the glue was breaking down the plastic while drying, and after a bunch of shots, they were giving out, but taking the wood with them on each half.
Be careful, and learn from my mistake!