This is happening on the Galaxy S4 as well. It’s unbelieveable how nowadays companies can sell worthless products that don’t work just to get the income. There is absolutely no recourse because the data on the card is irreplaceable. I was using the Class 10 SDHC Micro 32GB in my phone for 5 days. All of a sudden, it starts with the “card unexpectedly removed” error. Then it would unmount and mount continuously. I figured I’d at least get the data off by putting the card in my laptop. Nope. All I got was a “no drive” error, so everything’s gone.
SanDisk is a huge company so like most large companies today, they probably couldn’t care less, but I really hope they lose something as important to them as everyone using their products is.