Game Buttons Gone Missing

I was in my Grand Arena doing a battle of Ahsoka Tano, Ezra Bridger (Exile) and Huyang vs Jabba the Hutt, Leia (Boushh) and Krrsantan and I had just gone into Ahsoka's ultimate ability and used Ezra's second special to Exile Boushh, and then my buttons disappeared and I was stuck sitting there doing nothing until the battle ended. And I tried clicking any button I could multiple times but my battle buttons didn't come back and I lost the battle because of it. Usually the game has some lag issues after using Ahsoka Tano's ultimate but usually my buttons don't go missing for the rest of the battle.