Huh? By Carbon, do you mean Carbon Fiber? CF <> Fiberglass. The fibers are carbon, not glass. Unless there is a defect, the CF + resin should be much stronger than the wood core, and the sandwich of the two should be insanely strong.
My guess is there was some sort of delamination or flaw in either the core, or the CF. based on what you are saying, I'm betting both cores were cut from the same peice of ply and share the same flaw in the plys of the core. Be interesting to hear what it ends up being.
Glad it hasn't happened again.
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