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Weird. I had the same thing happen to me yesterday during a dive and came here to ask about this very issue. However I don't have the faceplate as I only noticed its absence after it had departed. I am in Mexico for another month and a half so I intended to continue to dive with it in that period. Unless anyone has a better suggestion? I am concerned about getting scratches on the glass. It seems like something you would not expect on a computer of this cost. It has something in the order of about 250 dives on it...rinsed in fresh water after each and every use.
I agree, it's definitely a weak spot of this computer. As far as the screen goes, I put a Zagg screen protector on mine and removed the plastic thing and never looked back.