If you send a space three times in the chat you get a false warning. To other users, this space appears as “_” rather than as " ". It’s been happening for well over half a year, and it reproduces every single time except for about 45 seconds after each warning.
It probably thinks it’s an actual issue and picks it up as being slow since there’s no text contained which is usually what happens when it’s slow for real.
I’d think as a resolution there could be a phrase that it filters in an attempt to see if it also returns a " ", or a beforehand check to see if the phrase is a space and if so then simply don’t filter it, or not allowing someone to send only a space in the chat.