This question already has an answer here:
Today I had "serial upvoting" reversed and lost 40 rep. But it is hardly can be called serial voting: seems that a user was voting for requests he liked in this recent post and also voted for 4 of my 17 (yeah, I have many :D) feedback-answers to this question. It would be conspicuous if the user would vote all the 17 of my answers, but he didn't (and even in this case it is one question, so theoretically, a user can vote all the answers, but can just run out of votes if there are more than 40 answers).
How can it be serial voting?
It was reversed today and therefore I have rep capped at just 160 :(