Vane cron vanishing buttons

1st time it happened was in gac with a attempted clean up of a Pkh team with aphra. The battle continue to progress and I was using specials and all of a sudden the buttons ended up disappearing, the game was just locked in limbo. I ended up farming the vane cron and was testing it out in squad Arena versus a Lord Vader team and the same thing happened again and could be duplicated multiple times with getting down towards the end of the battle with nightfall trooper and CX 2 still alive and went to use Brutus’s special and the buttons ended up disappearing again and the game locked up .