Apologies if this is not the right place to ask this.
I noticed today that earlier this week, four of my answers (mostly a few weeks old, all with quite a few upvotes and no previous downvotes) were downvoted within three minutes, with no explanation given in any case. I assume it was the same person, though I know of no way to confirm that.
I'm not hugely bothered by this (-8 "reputation", oh no!) but it does rather look like someone decided to find all my recent-ish answers and downvote them all at once, for some reason.
Is there anything in the system to detect and prevent someone doing this?
If not, shouldn't there be?
Again, I'm not upset, I'll quite happily live my life without ever thinking about it again; but if there's a reputational "scoring system", there ought to be a way to prevent malicious interference, should there not?