I don't know what the deal is, but my SP keeps losing my SDCard randomly (i.e., no particular reason). It's there one minute and then it's gone. This is a perfectly good brand new 32GB Class 10 Sandisk Ultra. I have it formatted as NTFS. My biggest issue is that I have all my Modern UI apps running from the SDCard and when the SP loses the card I can't access my Modern Apps. Reseating the SDCard brings it back but I have to reboot if I want my Modern UI Apps back. Major pain. The hack I use to run my Modern Apps from the SDCard isn't causing the disconnect as the card was doing this before I ever set that up. The strangest part about this is the sheer randomness. There is no particular event which triggers loss of the card. I searched online and many people offered up the standard, "your card is bad" answer, but this card is fine. I tested it in my Note II for a week and it worked flawlessly. ** The key question is this. The card obviously works. What event is causing it to unmount? There has to be some error somewhere that is triggering the unmounting. Some people online have suggesting setting up VHD's and all that to keep it mounted but I shouldn't have to do all that. Is it only the Sandisk Class 10's having this problem? I also tried the card formatted as exFat and that also had same problem.