Intermittent Serp?

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Anyone have an explanation as to why some rankings are changing  a few times
a day? it seems to be happening for at least a week for sure but it could
actually be happening for 2 months...

it doesn't do it on all your positions... just some keywords...

i think i've read something like google updates (google dance) continually
now but this seems a bit too drastic

anyway noticing anything like this?

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