Yeah, that is only easy reason I can imagine. You can cross the wood grain and turn it into "veneer". That would quickly average out natural wood grain out of i

Yeah, that is only easy reason I can imagine. You can cross the wood grain and turn it into "veneer". That would quickly average out natural wood grain out of it. But you can't cross the glue planes. Now if you scale that up, the likelihood of having faulty glue plane could go up. It still doesn't sound like static stress problem. More like fatigue causing delamination. I'm still bit suspicious because this would be too easy to explain.