Suspicious flux

[EdLongley]

We currently rank #12 for a competitive term. Every now and again we'll drop below rank #50 for a day and then we'll be back at #12 the next day (as was the case yesterday and today). We also dropped in the same fashion for two other terms that are arguably a little less competitive. There were no alerts or messages on Search Console and no major site changes. What could be the cause of this? Is it a suspicious flux and if so, what could be the root of it?

[ati1]

Is there a redirect on the page that is ranking with the term? We experienced the same thing and we found that the 301 redirect we had got erased somehow. Once we put it back in, we returned to the same position.

[RP.Companies]

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