Can't log in anymore in Ultimate Team

At first I was stuck in the gauntlet's 3rd round and couldn't advance either. Everytime I finished a game, or left the match I got booted out of Ultimate Team and then got back to the 3rd round. I tried to quit completely the game so that the gauntlet status resets, but now I can't log in at all in UT. I get booted out after the "Promo Cards" screen.