Hey, I had a similar problem happen recently...
I held a position for #1-3 on Google for one of my keywords (a Korean model's name) for a good 3 months for a particular post and then in the last two weeks it disappeared to around the 50th result (along with an incredible drop in traffic).
I was worried that it was because of my SEO techniques that might seem like spamming keywords...but checking today, I am now back on the first page (whew) after about two weeks but with a different post.
I think it's just luck sometimes...Google's indexing technique sometimes behaves funny
Best of luck to you!
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