This is a recurring problem. There are times when I am doing a mission to open any relic. When all four people get to the end of the mission there is a bug where the rewards pop up and we can pick what we want but we stay permanently frozen on the screen. I waited for about 30+ minutes and it still does not let us leave or exit the mission properly. it is stuck on the rewards. Like I said this has happened before to me at least 3 times.