@JJSagan This issue isn't only with Redactor.
You can easily reproduce that issue by writing custom CSS/LESS in your dashboard. As it turns out, Postgress cannot emit messages larger than 8000 bytes.
There should be some mechanism that prevents from a notification to be broadcast if the payload is bigger than 8k bytes. Alternatively, truncate the notification OR send the notification in batches (which will require some front-end adaptations).
Also, the switches that enable or disable the "live reloading" or "live updating" aren't disabling the notification itself, they just don't LISTEN to the notification so turning those off does not resolve the error.
This error is all over in version 1.10.2. In version 1.11.1 I didn't get an error when adding custom CSS/LESS so maybe something changed?