So I keep all my music on the SD card on my Surface Pro, and when I first got it I transferred all my music from my NAS over wifi onto the surface's SD card. Then about 3 weeks ago, the music app shows "downloading 2405 songs..." and is counting down. I'm seeing maxed out network usage, but I don't seem to be losing any disk space. However, I can't play a lot of the songs through the music app until they're done "downloading." What the heck is going on here? I have all the cloud syncing and downloading options turned on on my Surface Pro, WP8 Phone, & Windows 8 computers (desktop, laptop & HTPC.) But the Surface is the only one doing this weird download thing.