Not sure if this is related, but Yahoo lately have been creating excessive traffic on my
website hostings, because of their new, "improved" bots. You can read more
here. Until they conform to something less extreme, and because I need my DB connections and bandwidth for humans, not bots, I have banned their IPs through CPanel.
People might want to consider doing something like this, I 've had literally 100's of yahoo bot sessions on my
website hostings at any given time before banning them. The IP block is 74.6.0.0-74.6.255.255 and is all owned by Yahoo, so you can be sure you won't be banning anyone else.
EUKHost people could probably let us know if they noticed anything related to yahoo?