I just got a 64gb micro sd card yesterday. Installed it in my phone with no issues or alerts. Today I went to move a movie over from the internal memory over to the card and it successfully moved, and then literally two minutes later I got the dreaded "sd card is blank or has unsupported file systems". It was just one movie so I had the phone format the card and the same message persists. When I go into the settings and go to storage it asks me to Mount the card, I do so, and the message is still there. I've been on Google all day and have yet to find s legitimate fix for this issue. Have any of you had this issue and have you been able to rectify the problem at all? Thanks in advance for any help you can offer.