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Latest minor Android update for Xperia Z3 Compact keep resetting my home screen. I think that has happened 3-4 times now. First time was after first update. Then It has occured after changing sim cards a few times too. This is really annoying and I'm seriously considering changing phone because of this inconvience.
Also after latest Android it takes a long time for the camera to start working and my SD card access is really slow (takes a while to display SD card apps after booting up).
Try settings-apps-all-xperia home,force stop and clear data. Will reset your home screen.
This has been covered here too:
/t5/Xperia-Z3/Help-Please-Vanished-apps/m-p/1057906