That's got to be so irritating - and dangerous! I'm sure that this has happened through the years with any kind of glass bakeware. But a few years go there was a story on the news about how there was suddenly a rash of these incidents, enough that consumer protection got involved. I don't remember the specifics (old brain in a rebuilt chassis) but I do remember watching the story on the news and calling my sister about it. She said she had just purchased hers a few months before.