Thanks for reaching out. If you believe your video was taken down in error, you can appeal. Our Help Center explains how: https://goo.gl/Gks8WR . Hope this helps.
I've seen that happen before with mass-flagging campaigns. What it appears like is that, since @YouTube can't be bothered to actually vet any flags, they just remove it once it reaches a certain threshold. Obviously, since their processes are opaque as hell, no one knows.
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