What does the phrase windows failed mean in poem you heard a fly buzz- when died?

In the poem titled _You heard a fly buzz - when I died_ by Emily Dickinson, the phrase "windows failed" suggests a loss of connection between the speaker and the outside world. It connotes a sense of isolation, as if the speaker is confined and unable to interact with their surroundings. Alternatively, it could symbolize a failure in communication or a breakdown in understanding, as if the windows are no longer serving their purpose of allowing light and information to pass through. The use of the word "failed" captures a sense of decline, suggesting a deterioration or loss of function, which might reflect the speaker's fading vitality as they approach death.