Hi all, I have an Xperia Z1C and a 64GB SD card running Android 5. All has been well for a long time until a couple of days ago when I was transferring an app to the SD card and the phone crashed and rebooted. Since then I had files disappear when I tried to write them to the SD card, and now I can't write any files to the card. - If I try on the phone (via Ghost Commander and the Storage Access Framework) I get an I/O error. - If I connect the phone to a PC and try copying files that way, the copy operation just hangs for a few minutes then gives me an error about the phone being locked (which it isn't). - Even apps can't write to it. The camera is set to write files to the SD card, and now taking a photo makes the camera app crash, and no photo is saved. I can read from the card fine, and if I physically take it out and plug it into a card reader, it will read and write with no problems. Chkdsk reports no errors. So it seems that the phone is just suddenly refusing to write to the card, though the card itself and the filesystem is ok. Has anyone else had this issue? Any ideas on how to resolve it? Any thoughts much appreciated. This makes the card (and phone) pretty useless.