What annoys me about postings from this portal is that for those reading in the normal traditional way, ie not on the web but via a news client, unless the poster specifically adds it, there is no indication of how old the thread/topic is. I doubt anyone wants to go on the web to read it on there to find out the true context or whatever they say, actually is.
Anyway, this thread topic seems to come up on newsgroups quite often. I suspect it has something to do with some stress on the panel, and with temperature cycling and the brittleness of glass, sooner or later something breaks. Brian