Crack at 12 o’clock: potential origin?

Bad quality racket/manufacture defect. Had this on the outside on a model at the same position twice and never experienced/have seen it again. The model was well known for it’s quality and built like a tank. My rackets got replaced.

If you look at your picture, the shared holes for the top crosses, the material also looks brittle and the holes seems to splinter. If you ask me: Warranty issue, has nothing to do with stringing.