Hey guys, I just purchased the Surface Pro 2 and love this device! I am a long time MacBook Air and iPad user and thought to combine the two for the ultimate in portability. There is one thing that is making me a little nervous with my purchase and wondering if I should return it... I bought the SanDisk Ultra 64 GB microSDXC UHS-1 along with my purchase at Best Buy and it was acting quirky. I have been moving large Steam files back and forth to this micro sd drive for the last 2 days and while downloading a game from Steam, the microSD card just vanished from my system. I had to take it out and pop it back in to be recognized. I ran a scan and no issues were reported. I started downloading again, and the card again vanished from my system. My concern is that I have only 12 days to return this unit if this is truly defective. I can't imagine a brand new SanDisk card having issues so suddenly. Any thoughts on what I should do? Crap, as I was writing this, the card disappeared again.