Gauntlet challenges

Impossible to complete the challenges for gauntlet. There seem to be missing game modes. Took me several days to complete the deadlock challenge because the game mode would not appear now. It's been several more days and the vendetta game mode never appears in queue. I played dozens and dozens and dozens of games and cannot get vendetta to come up so I cannot complete the challenge. 

It seems that gauntlet just plays the same few modes over and over again rather than cycling through all of the modes. This needs to be fixed somehow.