I recently had a micro SD card that was giving me problems and it affected the normal start-up of my Clip Sport player.
I resolved this situation two ways.
I began using a brand new Samsung 16GB micro SD card and my player was all back to normal.
I used Win File Explorer to complete a full format of my old memory card (using the micro SD card adapter).
Full format = “unchecked” quick format selection box for FAT32.
The full format process seemed to repair my old micro card (so far) for normal use in my Clip Sport player.