I have had this self-destruct phenomenon occur with 2 pieces of glass over the years, the first nearly 20 years ago in my very early collecting days. It was a very thin, almost scientific looking bulbous vessel, & it developed a perfect division between the neck & body/bowl of the item quite spontaneously. It was on a windowsill (sorry, but I was young & foolish then!) & it basically cracked & collapsed. I have no doubt now, in retrospect, that it suffered from extremes of temperature.
Second one was more recent, a Nason style vase black with aventurine spatter. That was less dramatic, however. I had owned it for a couple of years & one day I noticed a crack (which has "held") all the way through it.
It was not on a windowsill, but it was in a room that undergoes severe temperature changes from our greatly overrated climate. That is, variants of up to 35 degrees C. or more between summer & winter. The room has a flat, skillion roof with probably no insulation.
I have bought loads of glass that has been sent via air mail, all of it has survived the long haul flights except for a couple of pieces which suffered more from very poor packaging than altitude stress. In fact I shipped a fair bit of glass back from my 2003 trip to France (a paperweight) & England (several vases & a Murano cigarette lighter) in my hand luggage! No problems there!