With 1.19, multiple servers are having these semi-crashes where the server lags out and goes down to 0.01FPS. There is no "crash", nothing in .RPT, script or crash logs. Server doesnt shut down, reboot or stop - it continues to run and players can still be in game, writing in chat etc. During the following 5 minutes the players are gradually getting a disconnection.
Server can then again go up and players can connect - with no interaction from the server owners.