What phone do you have? What is the size of file you are trying to move? Ebay is a dodgy place to buy SD cards as there are a lot of fakes ones out there! Usually hacked to give a false capacity and very low quality components used in manufacture with to-good-to-be-true prices. This could be what is causing the issue. I would recommend paying the extra for an SD card from a reputable retailer or a bit of hunting on Amazon.
Sent from my Nexus 7: Pimp Edition.