Put a link to a set of FAQs on the email that is sent out to people when they lose. The FAQs could cover all the possible scenarios (Sunday night lead times, re-usuing bid groups etc etc) and thus go some way towards explaining what happened.
Thus, a frustrated loser (I know that sounds bad, but you know what I mean!) will immediately have something to read that might remove the necessity to vent their spleen on this forum. AS might even keep them on-side!
R2