Had an odd experience this morning at DCA - my flight was delayed due to a missing crew member, GAs kept saying "they're on the way," then finally "she's left the hotel, will be here in half an hour." Pax around me were grumbling about how she probably overslept, deserved to be fired, etc, but I overheard the crew talking about it being some sort of central scheduling/communication snafu. If so, I felt kind of bad that the GAs implicitly put the blame on the FA.
In any case, maybe there are more widespread scheduling glitches.