Coliseum T6 Zeffo Guardians BS!

Second day in a row now total BS in coliseum. The last 2 days I am getting literally 99% on both Coliseum match ups and then its like my characters just dont work. I have just had a 5 team beating the last guardian for 5 minutes on 99% and every single hit is doing 1 damage with no shield, some serious tweaking needs to be made as the game also keeps stuttering snd crashing then resuming fine but then I get wiped out