I have a Samsung Galaxy S5 running 4.4.4 on the G900VVRU1ANK2 kernel, which was supposed to fix this issue, but in my case seems to have caused it. When the problem appeared, I tested the card thoroughly on a PC and other devices. The card works fine. I did a factory reset of my phone which didn't fix the issue. I have tried 2 other brand new cards from 2 other manufacturers and they won't work either. The current card I am using is a brand new 64GB Samsung card. I tried formatting using the FAT file system on my PC and still it won't work. This is clearly either a spontaneously occurring hardware problem or the last update broke it. Does anyone have any suggestions for how to resolve this issue?