DISCONNECTED error from Shuffleboard

I was using the desktop simulator today, and when I brought up the Shuffleboard, I started getting this message in the log:

NT: Got a NT4 connection from 127.0.0.1 port 30882
NT: CONNECTED NT4 client 'shuffleboard' (from 127.0.0.1:30882)
NT: Got a NT4 connection from 127.0.0.1 port 30892
NT: CONNECTED NT4 client 'shuffleboard@1' (from 127.0.0.1:30892)
NT: DISCONNECTED NT4 client 'shuffleboard@1' (from 127.0.0.1:30892): remote end closed connection
NT: NT4 socket error: operation canceled
NT: Got a NT4 connection from 127.0.0.1 port 30898
NT: CONNECTED NT4 client 'shuffleboard@1' (from 127.0.0.1:30898)
NT: DISCONNECTED NT4 client 'shuffleboard@1' (from 127.0.0.1:30898): remote end closed connection
NT: NT4 socket error: operation canceled

It kept repeating over and over. The same code did not had this error previously and nothing in the robot code has been changed. Any ideas?

Have you upgraded to 2023.4.1? This issue should be addressed in that release (make sure you use the installer so you get a new Shuffleboard version as well).