Hi, I have a 64GB Sandisk MicroSD card in my new SP2 that is randomly going offline. The drive "D" is there and it's showing an XD card installed but I cannot access the card. This card worked perfectly fine in my original SP1 and in my first 128GB SP2 that I exchanged yesterday for this 256GB version. If I pop the card in and out, voila, it comes back on line and can read and write just fine. Sooner or later though it will simply go offline again for no reason. Card is using Bitlocker but it was using that in the previous two units as well. Any ideas? Thanks!