This question already has an answer here:
On StackOverflow a user posted a straight up lie as an answer to someones question a few moments ago, I down-voted it and commented on why it was wrong and provided linked evidence. The user realized he was wrong and deleted his answer and since then in the past 3 minutes... every 60 seconds one of my old questions has been down-voted for no apparent reason. I am loosing reputation quickly, what can be done to stop this pathetic behavior?
Edit: since posting this one of the 3 serial down votes has been removed, the other 2 are still there.