SAME PROBLEM!!! (I bought from sandisk authorized retailer too) , I had my Ultra UHS-1 Class 10 64gb for 1~month then it started getting curruption, I was able to back up most files, but at 99% copyinh the card died.
Android ‘fdisk’ shows the data as 32MB, it is also locked I cannot create partitions or anything, windows and my sdcard reader can’t even read it, the usb-reader shuts off instantly (no lights), my macbook shows it as 32MB just like android…
the card just stayed in my tablet so it was never abused and its only a month old, the quality controll on these cards is horrible, and they are expensive , MY no name brand cards last longer for example TopRAM and transcend no problems use the every day I expected higher of SanDisk…
Command (m for help): p
Disk /dev/block/mmcblk0: 32 MB, 32096256 bytes
4 heads, 16 sectors/track, 979 cylinders
Units = cylinders of 64 * 512 = 32768 bytes
Device Boot Start End Blocks Id System
I just hope the RMA proccess is easy and has a quick turn around this error should not happen to so many people, sandisk should really do advanced replacements for this issue as I’m sure they know by now these cards are all effected by this issue.