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What can I do if I’m the victim of serial downvoting?

Just got 3 downvotes at once for old, totally unrelated questions of mine:

• Possible to scroll caret into view inside a single HTML text field with JavaScript?
• Simple algorithm to crop empty borders from an image by code?
• Exception window in VS.NET 2010 is missing the "User-unhandled" column

Could this count as kind of a "vandalism" that I can do something against? Or at least see/know whether this was done by the same guy?

Edit 2014-07-20

Just for the record, here is another massive downvote happening today:

Someone seems to be really angry about me. I hope the automatic system will catch up on this.

Edit 2014-07-21

Yeah! The downvotes were automatically removed.