Rush team formation failed

Everytime i try to enter a rush match, for more than two weeks, i get this message. First it says teammate(s) found, the players join my lobby, and then i get team formation failed. Rush was one of my favorite modes in UT and i used it to get the seasonal objectives but ive been unable to for at least two weeks. Before that the game would crash every two games but that fixed itself so i thought the same would happen but no. Please if anyone has any solutions share.