Yep. I was wondering the same thing. No key-changing between blocks this time, but (s)he is hitting blocks just about immediately after leaving the queue.
Last time, I was guessing that (s)he was mining using cloud computing rentals because of the way the accounts kept vanishing for a while, then coming back - as if a purchase agreement had used up its allocation, then been renewed.
I'm curious to see if that behavior starts again, too.