Just go back to the original boss post to reroll. Typically when @lordnigel needs to take the game down he makes a comment on the stage post saying that the bot is down for maintenance. When everything is good to go again, he posts again on the same stage post to say that you can pick up where you left off. I can't think of a scenario in which an entire round would have to be reposted.
Sorry for any confusion that may have resulted from the bot acting up on the boss stage.
thank you!