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This happened to me for awhile too. I think people that disagreed with you on a previous post are using bots to downvote you.

• mandelbrotwurst 7y ago
  This would surprise me given the fairly high karma minimum to downvote.
  • novok 7y ago
    Make a new account every time you reach the threshold, add it to the bot list.
    • mandelbrotwurst 7y ago
      Yeah, I thought of that, I was just thinking that surely someone able to create sufficient karma to do something like that would necessarily also be unlikely to be petty enough to bother. Maybe I am too charitable.
      • novok 7y ago
        You can gain karma fairly casually by just using the site, you get 1 karma per comment, so it's easy to make it a passive activity. The site has also been around for over a decade, lots of opportunity to accumulate.