Whenever TOAD has lost it's database connection and you try to close TOAD or close some of it's windows, multiple errors can display. Errors are displayed for each window that is closed. If a connect or related error occurs when closing TOAD or a window, it should quietly be ignored in the background. Examples of types of errors displayed:
"ORA-03135: connection lost contact"

An enhancement request has been created on the Toad Idea Pond. Click here to review, comment and vote on this idea.