FIFA 13’s Ultimate Team mode has been offline due to bugs with the trade and auction house features causing players to lose their trade cards. The bug was discovered by EA after players filed complaints about their trade cards disappearing and sold cards being stuck in their trade pile. Many also experienced not being able to transfer purchased cards to their teams.
The bugs have been fixed now, and everything should be working fin, according to EA on the official FIFA Twitter: “#FUT is back up on console, Web App and on the iPhone app. Thanks for your patience,”