I've had the phone almost 2 years. The SD card has always been there and worked fine. All of a sudden I notice that my music is deleted from my phone. It's been deleting pics from my gallery also, but those we're all in my Google photos app. I removed the SD card and put it in my laptop, worked fine and there was all my music. I formatted it and tried to put back in phone. Main problem is under settings and storage I no longer have option to change save location or mount the SD card. This is all in grey and cannot be clicked on. When I go to apps in settings it also no longer has the option to move things to say card. What can I do to fix this?