What do you consider a sign for something bad to happen in a roleplay? Bad referring to negatively impacting the roleplay; be it by ruining the mood, causing it to die and etc.

For example, I consider it a warning sign when a majority of an RP is made up of people new to the guild. I don't want to stereotype or anything but these people have a very bad tendency to speed or overpost in the beginning and then vanish without a word. I'm not saying existing guild members do that but they have a lesser tendency IMO.