Whose reputation has gone down too these days?

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I responded to a friend's discussion a few days ago and since then I've been thinking: why did my reputation go down like that so suddenly? I have been at 97/100 for months and it never went down... a few days ago I had 98 then 95 and now I'm at 94.... What did I do so wrong? Whom did I upset? Have you experienced this problem too or is it just my fault? Please tell. Thanks in advance, Roxana