This happens if a room had no messages for 14 days. The system always keep at least one room for the site open, but there are other rooms associated with this site.
What (if anything) should be done?
- Maybe this is a sign that the main chatroom isn't really needed. After all it was frozen because there were no messages for some time. (And some of the messages in this room were posted just to prevent it from freezing.)
- If the room should be unfrozen, this can be done by a moderator. What is a good way to attract the attention of the mods to this issue?
- Some rooms use a bot to be immune from freezing - the bot post a message in the room if there was no activity for some time. This is suitable if the community wants to keep some room indefinitely. Would this be a solution? If this is the preferred solution, can somebody set up such bot?
1By the main chatroom I mean the room which was includes the "welcome message" and was created at the creation of the sites. Of course, in all aspects (from the viewpoint of the Stack Exchange software), this room is the same as other rooms associated with the site. (The room is called Off the record. See also: Let's name our chat room.)
Here are some posts where you can find more details concerning frozen rooms: