When everyone get DCed this is the ping.
LogNetSerialization:Error: FBitWriter overflowed! (WriteLen: -1, Remaining: 4014, Max: 4014)
Followed by
LogNet:Warning: Closing connection. Can’t send function ‘ServerOperation’ on PlayerController_0’: Reliable buffer overflow…
Closes all connections to the server, one by one, until the server is empty.