Loved it for 18 months. Then, this morning, at 3am we heard a crash, got up out of bed and the glass door was shattered but most was still standing. As I was looking around to see if something had come through the wall and hit it, the rest of the glass door collapsed into a pile of glass covering the inside seat, floor, and bedroom carpet in tiny glass chunks and slivers. It just shattered on its own. After about two hours of scooping glass and vacuuming up, I got online with JHN. They said that they never heard of anything like this happening and were glad nobody was hurt, but unfortunately, the glass door is not covered by warranty. Yes, I agree, I'm glad we were not in it at the time. They recommended that I contact a glass company to make a new door, and to be sure they use tempered glass. That is about what I expected them to say, I mean, after all, how could I expect them to be responsible for a glass door for 18 months, but still a bit disappointed. BUT PERHAPS THIS IS WHAT HAPPENED: Maybe add Sauna Doors to the list: Transcript for Consumer Alert: Spontaneously Shattering Glass"Gma" investigato investigates." And on the agenda, large sheets of glass that shatter for no reason. Things in your home, glass tables and shower doors and can be scary. Mara schiavocampo has what you need to know to stay safe. Reporter: Take a look at this man, shattering his own shower door. What? Reporter: After he says the glass spontaneously cracked, and he's not alone. From glass tables. Out of nowhere, our patio table exploded. Reporter: To shower doors, some consumers are shocked by what they found. I heard an explosion, and I came down to this. Reporter: That's what Dwayne Bryant of Chicago says happened to him. Right here was the leaf bowl. Reporter: Last summer he says he was awakened in the middle of the night to what he thought was someone breaking into his home. There was green glass all over the floor. Reporter: His glass sink shattered into pieces. The power was so hard, it was also in the tub. Reporter: The consumer products safety commission told us in the last two years there have been hundreds of reports of spontaneously shattering glass. The top three culprits, shower doors, tables and sinks. So what's going on? To find out, we went to glass expert mark. The reason tempered glass spontaneously shatters, it might have a flaw in the edge or a scratch in the surface. The other reason is occasionally there's an impurity in the glass when it was melted from sand. And it's called an inclusion. Reporter: That inclusion, a tiny ball of metal made of nickel and sulfer growing over time. It grows, it can actually pop the glass. Reporter: He set up this demonstration to show us what can happen when tempered glass breaks. He says the cracks move at speeds up to 3,000 miles per hour. Tempered glass is a specifically-designed product that breaks into very small pieces to reduce lacerations and cuts. Reporter: The industry representing glass manufacturers told us it takes extraordinary steps to minimize the potential for nickel sulfide inclusions. Considering a large glass furnace may produce up to 800 tons of glass per day, total elimination of contaminants is not possible. Now that group adds that the accidents are rare. As we heard in the piece, it's designed to be safer, but it can still be dangerous. The consumer product safety commission tell uses spontaneously shattering glass can cause injuries, in some cases requiring medical treatment, mostly for stitches, and usually during installation. The power. Moves so quickly, can happen without any notice at all. Thank you very, very much.