Yesterday I operated 40 meters SSB from 7 to 9 pm.? My pace was comfortable.? I had a few QSOs here and there but rarely swamped by more than three calls at once.? There were 5- or 10-minute intervals with nothing. At 9 pm I handed K2B off to K2LLC and he was immediately (and I mean immediately) swamped with a pileup.? How can that be?