"@<a href=""https://www.youtube.com/watch?v=iZnLZFRylbs&amp;t=3m48s"">3:48</a>; I feel like a simple explanation as to why a computer device decides to do maintenance at an inconvenient time is that to a user - any given time could be inconvenient", but maintenance has to be done <b>some</b> time, and it doesn't know when the next time will be convenient to do maintenance.