I don't know it seems quite odd that 300 servers would be down for a week or two like that. It could be some serious server problems, costs or something. It could be a ton of things but it is weird how quick it drops then 1 to 2 weeks later lifts back up so abruptly. It wasn't Patch Y though if since that was only a couple months ago now and this dip happened back in I would guess August to October or so.