I think I'm in my 3rd group since raiding the original Coil. I've been in the same group since raiding 2nd Coil though. There really hasn't been much drama in the groups I've been in, it's mostly come down to real life circumstances or disinterest in the game leading to people quitting and either having to find replacements or the group disbanding altogether. In my current group we've had to replace two people since 2nd Coil started, but people have remained committed otherwise.