Have you ever seen a frameless glass shower door shatter on its own?

I have never had it happen but I know ya really got to watch running a diamond wedding ring on those glass doors. One deep scratch is sometimes all it takes to get the crack started. Then, POW.
 
Had it happen twice. Our glass company covered both since they were relatively new builds. They explained it as possible improper tempering which could have been caused by the amount of lead in the glass wasn’t the proper ratio. ????
I initially thought maybe the glass was under just enough torsion somehow from something but could never verify that. Everything was plumb, level and square.
It’s a head scratcher for sure.
 
Likely the wake of a gravitic propulsion craft flying over your house.
 
Hinge or grab handle fasteners over tightened? New build?

The glass door and side panel was installed seven years ago as part of a bathroom remodel.

The only thing that I can see as a potential issue is the wife leaving a towel hanging inside the outside door opening to allow air to better circulate and reduce mildew. Over time, perhaps it gave the door a slight twist at the top that eventually led to the collapse. Whatever the case, she won't be doing that any more.
 

Spontaneous Shower Glass Breakage

You may have seen reports on the news about glass breaking spontaneously. But what causes this breakage? In some cases, it’s due to the inherent nature of the tempering process. Spontaneous breakage can occur due to nickel sulfide inclusions in the glass. The inclusions can sometimes grow over time and cause stress, which can then break under heat or other external stresses. These occurrences are uncommon and should not deter you from having a glass shower installed in your home.

Some glass manufacturers conduct what’s called heat-soaking. Because spontaneous breakage can happen when nickel sulfide is in the glass, heat soaking is done in a chamber. It exposes the glass to higher levels of heat than the nickel sulfide can withstand. This allows the glass to break in a safe environment rather than during installation or while in the end customer’s possession. Because this is a destructive, pass-fail test, not all companies choose to do it.

Another side effect from heat-treating is that while the glass becomes more resistant to a direct impact, it is more susceptible to side impact. A small side-edge chip in the glass, for example, could eventually make the whole door shatter.
 

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