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In this case,why don't you let a sony service handle your device?
Could you try a different SD card?
Which class are the SD cards?
That's quite odd
Have you tried to reformat using a low level tool? Uli,remember someone said he got a Sandisk but it wasn't exactly what he ordered?
/t5/Xperia-Z1-Z1s/Erratic-Xperia-Z1-Camera/m-p/921557#M37972