TCP - The IO operation has been aborted because of either a thread exit or an application request

Hello, I am trying to implement a class that connects to a server through TCP, receives a message, opens a server, then sends a message through that server to all connected clients. This class seems to work, however, incrementally I will receive:

System.Net.Sockets.SocketException (995): The I/O operation has been aborted because of either a thread exit or an application request.
   at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
   at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource<System.Net.Sockets.Socket>.GetResult(Int16 token)
   at System.Net.Sockets.TcpListener.<AcceptTcpClientAsync>g__WaitAndWrap|31_0(ValueTask`1 task)
   at ReversingMill1CommsService.Worker.ConnectAndSend() in Worker.cs:line 153

and then eventually:

System.InvalidOperationException: Not listening. You must call the Start() method before calling this method.
   at ReversingMill1CommsService.Worker.ConnectAndSend() in Worker.cs:line 0

https://hastebin.com/depiviqoci.csharp

closing in favor of:

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