I have dis problem of random files and folders disappearing from my sd card constantly.i hv been battling with this issue for months nw,sometimes it shows that the sd card is full yet i cnt even access up to 1gb of the contents in it,at a time i saw folders with random symbols that is not possible to delete no matter how i try,i hv lost many important files,should i format it nd start all over or buy a new sd card? I need ur advice pls.