About error "Terminal Error: Timeout"

Hello,

Im developing a project using Mainframe terminal (Micro Focus Reflection)
When robot running on customer environment, Timeout error sometime occur but on development environment, timeout error didnt occur.

This error appear on any activity Send Key or Send ControlKey.
I dont know the root cause why terminal has timeout.

Can anyone help me on this error?

System.Exception: Terminal error: Timeout
場所 UiPath.Terminal.Activities.TerminalActivity`1.EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
場所 System.Activities.AsyncCodeActivity.System.Activities.IAsyncCodeActivity.FinishExecution(AsyncCodeActivityContext context, IAsyncResult result)
場所 System.Activities.AsyncCodeActivity.CompleteAsyncCodeActivityData.CompleteAsyncCodeActivityWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)