Originally Posted by HarryT
Of course we don't know for certain, but the simplest explanation - that it's had a knock - is, I think, by far the most likely one, and I very strongly suspect that Bookeen are going to say the same.
If you bought a delicate glass ornament, and several months later took it back to the store where you'd bought it and said "it just broke all on its own", I don't think the shop would be very likely to exchange it free of charge - do you?
It is a question of evidence.
But your statement was a factual statement that some specific things do not break spontaneously and I think that statement is wrong.