Tombo
I bought the SanDisk 32 Gb micro SD card (class 10) in Dec for a new Galaxy S3. I used it for songs and video and pics. It started acting flaky in April and would unmount itself and then remount and I had problems with playing music. Then it completely died and would not even reformat. This is a known issue, and I will write back after I try to get SanDisk to replace it.