Pretty much every server reset, and there's been a few problems with the wards. I don't think it's meant to be a dail feature, but some servers seem to be hit worse than others... maybe if people spread out their retainers... but it still seems there are only 2 popular wards and that could be part of the problem.
FFXI:Sylph - Perrin 75 Hume THF; Retired (At least from my use any way)
EVE Online:ScraperX; Retired
WAR:IronClaw- Peryn SW;SkullThrone- Grymloc BO; Retired