We have 2 SanDisk 32GB µSD cards, 1 - 128GB SanDisk µSD card, 3 - Lexar 32GB 633x µSD cards and have received the SD card not present error message 1 maybe 2 times thus far. We tried to use the camera to reformat the µSD card and it failed once. We re-seated the µSD card into the camera slot carefully and it was then re-fomatted and the camera recognized the µSD card again. If I take an µSD card from Mac to Windows, or Linux to Windows, Windows ALWAYS says it wants to repair the µSD card. I NEVER run the repair in Windows, just simply reformat the µSD card fat or fat32. Preferably use the camera to format the µSD card if possible. I do not believe the problem lies in the camera, it is in Windows “repair” of the µSD card. We use Mac, iPad and iPhone most of the time because of this type of thing occurring.
Hope this helps,