azure-pipelines-agent: Please explain vsts agent error log

Hi! During agent autoupdate I can see this error in agent log ( taken from _diag/ folder):

[2018-10-29 15:53:51Z INFO SelfUpdater] Version '2.141.1' of 'agent' package available in server.
[2018-10-29 15:53:51Z INFO SelfUpdater] Current running agent version is 2.140.2
[2018-10-29 15:53:51Z INFO SelfUpdater] An update is available.
[2018-10-29 15:53:51Z INFO Terminal] WRITE LINE: Agent update in progress, do not shutdown agent.
[2018-10-29 15:53:51Z INFO Terminal] WRITE LINE: Downloading 2.141.1 agent
[2018-10-29 15:53:51Z INFO HostContext] Well known directory 'Bin': 'C:\agent33\bin'
[2018-10-29 15:53:51Z INFO HostContext] Well known directory 'Root': 'C:\agent33'
[2018-10-29 15:53:51Z INFO HostContext] Well known directory 'Work': 'C:\agent33\_work'
[2018-10-29 15:53:51Z INFO SelfUpdater] Save latest agent into C:\agent33\_work\_update\agent.zip.
[2018-10-29 15:53:52Z INFO JobDispatcher] Shutting down JobDispatcher. Make sure all WorkerDispatcher has finished.
[2018-10-29 15:53:52Z ERR  Terminal] WRITE ERROR: An error occurred: An error occurred while sending the request.
[2018-10-29 15:53:52Z ERR  AgentProcess] System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.Http.WinHttpException: The connection with the server was terminated abnormally
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Threading.Tasks.RendezvousAwaitable`1.GetResult()
   at System.Net.Http.WinHttpHandler.<StartRequest>d__105.MoveNext()
   --- End of inner exception stack trace ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
   at System.Net.Http.HttpClient.<FinishSendAsyncUnbuffered>d__59.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
   at System.Net.Http.HttpClient.<FinishGetStreamAsync>d__33.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Services.Agent.Listener.SelfUpdater.<DownloadLatestAgent>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Services.Agent.Listener.SelfUpdater.<SelfUpdate>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Services.Agent.Listener.Agent.<RunAsync>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.VisualStudio.Services.Agent.Listener.Agent.<RunAsync>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.VisualStudio.Services.Agent.Listener.Agent.<RunAsync>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Services.Agent.Listener.Agent.<ExecuteCommand>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Services.Agent.Listener.Program.<MainAsync>d__1.MoveNext()

Could anyone explain what does it mean? ( “The connection with the server was terminated abnormally”), I’d like to address this to our netwrok team, however I’d like to get vsts agent maintainers input first … Thanks