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Are you sure?The button has 2 phases:focus and shoot.
Have you tried settings-apps-all-camera,force stop and clear data?Restart the device.
Ithink something is wrong with your camera apps. Not the sutter button itself since you said it works on other mods. I'm very much inclined to ask you to do an update or repair. Since that will reinstalled the camera app and everything
else.
to be honest i can join the same problem , but in my experience problem seems to be intermittent and such annoying as when i want to take picture with app already running it take extra time to get things working and wondering what can cause such glitch in the unit with so high spec
Definitly a button link or transferring tape problem.. Had that on T-model.. when pressed it launched the app, but then was like unresponsive. The phone knew it should start a cam, but later there was no focus signal from it. They'll replace the button and wires in Sony service.