I just bought a sony z3 compact about 1,5 month ago and got a problems with it. SD card keeps fucking up once i copy data on it i cant use it normally and cant use every data on it so when i disconnect it and want to reconnect it doesnt work. Tried already to format and other things.
Have you tried with another SD card?
I already brought my first sd back because it was the same shit and they gave me another new one.
So ya