Have a PNY 128GB Card, it read it day one and I saw the files I put on it. Few hours later I cannot see it, still works in my PC. Reset my phone twice last night, reformatted card in PC, turned phone off and back on to get it to see it was corrupted. Reformatted, put files on same issue. I could not see it after a few hours. I read everything I could online, could the card be such low voltage that the phone does not like it? I am tempted to return the card.
