While I am finishing a game it kicks me out of ultimate team

Please note that I have played a lot of games in the ultimate gauntlet 8 Demo and I should already complete the objective. However as soon as I finish the game, for some unknown reason it kicks me from ultimate team. Please advise what I have to do. I made a lot of restarts but nothing. That happened a lot of times please check and give me the wins that I achieved spending time and effort. Thank you in advance for your swift response