Exploding Glass Shower Screen

hi I have read some other posts on here regarding curved walk in shower panels exploding without due cause, and the same thing has happened to me this evening.
Luckily no one was in the bathroom at the time, and I have photographed the evidence before clearing it up (3 small sets of feet to worry about).
The shower was bought in 2003, installed 2004, and has never been damaged in any way. It has been used virtually daily in those years (excepting the odd holiday), and I am genuinely at a loss to understand why it could explode like that.

Any help, comments etc gratefully received.

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