So all of a sudden this SanDisk ultra sdxc card stopped responding. I was downloading something and unexpectedly I got an error. Can't save to the Micro SD Card, Eject and Mount again. At this moment, I could not even see the contents of the card and thought it failed. ES file explorer says empty. I ejected and mouted it back again but still I can not write anything to it? Moreover, my camera stops as soon as I click a picture and obviously pictures are not being saved. Earlier i thought the storage could be reaching the Limit but No, it's 4-5 GB free. Not expected this from a SanDisk Ultra 128 GB, and it's not even that old. Six months perhaps. Luckily my data is not lost and so far I can access on my phone it but I just can't write? Can i fix this problem? Haven't yet tried formatting as I have some important data on it. Any help will be appreciated.