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Glued on ?

 

But that should not be a reason for it to fall off.
Lots of watch crystals are glued on and they hold forever.
Looks like a quality control problem to me.

That said, maybe Apple has decided to not apply the watch industry standard 5000g shock test for their watch development.
Things like this happen during such tests, and development has to continue until it no longer happens.

Don

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