Thank you!! I just bought a Z3 second-hand, and experienced exactly the same thing. Your soft-reset did the trick! Works normally now. Everyone, I highly recommend you try this first, before you try anything else, as it's the least effort - takes all of a few seconds and hopefully your problems solved too. If not then try the other stuff.
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This is what I know: The Z1 had Dragontrail only, and if you say Sony is not listed on Dow Corning's list of Gorilla Glass users, then it's probably safe to say that it's still Dragontrail on the Z3 (manufactured by Asahi Glass, not Mitsubishi). And yay for that!! This is my experience of Dragontrail vs Gorilla. Gorilla is more scratch resistant, because it's harder. But it shatters far more easily, because the hardness makes it more brittle (ask yourself how many iPhones you know of with broken screens - I know many). Dragontrail on the other hand is not as scratch resistant but far more robust. Because it's not as hard, it's also not as brittle. I have dropped my Z1 onto concrete, ceramic tiles and tar (pavement) on no less than 5 occasions over the last two years, from chest height, without any issues. The screen was fine every time, and the phone still works fine (only a few scratches on the aluminium frame). Suffice it to say that if Sony ever moves away from Asahi's Dragontrail, I will move away from Sony. I am sticking with them, because to date the Z1 is the best smart phone I have ever owned, and it is also the most robust. Unbelievably tough! I think the Dragontrail has a huge role to play in that. I would rather have a few scratches on my screen, than have it shatter every time I drop it onto a hard surface ...
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