I’ve had this implemented for over a year now, and have never once seen the message. After the error, many of the features from the server script stopped working.
What could have caused this, and how can I prevent it fully for the future?
That error usually means that you didn’t set up a listener for the remote either on the server or on the client (or, in rare cases, that you are firing the event/invoking the function too much). Are you sure that the server is connected to the RemoteFunction, and that nothing is spamming it?