I have a Samsung Galaxy Note 4 - going to get the Note 10 later this year, but until then, I want the SD card to work correctly in my Note 4. This issue only started a few weeks ago - otherwise it had been working fine for about a year. When I take the card out of the phone and put it in my computer, it works 100% - no issues. I did a chkdsk on it, no errors. It NEVER fails in the computer and all my files are there. With the SD card in the phone, once the files disappear, the only way to bring them back is to go to Settings, Storage, SD Card (which shows as being there), and tap Unmount. The card unmounts without issue, then I click SD card again and it mounts it - no issue. Then I tap Format and format the card - no issues. At that point for about the next 5 minutes or so I can access everything on my SD card - all the files are there, even though I just "formatted" the card. I can view the photos, share them, transfer them, everything - no problem. But after a few minutes, everything is "gone" again and I have to go through the entire process over again - very annoying. Obviously SOMETHING is causing a glitch with how the phone sees the mounted space - but only after several minutes have gone by. Has anyone had this issue and solved it?