Have exactly the same problem. With Z1 phone and 64GB card. Tried everything that came to mind. Including everything listed. Except another card. But will try that today. Card itself works between computers. Just not on the phone. Even when you transfer stuff with media go stuff gets deleted. Regardless of what mode is selected for usb connectivity. Syncing stuff works until reboot. When it's all fresh again..... Grinds my gears a LOT.
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