What can cause impression loss without rank loss?

In google search console, if you see a keyword that hasn't changed but one or two positions, if any, but lost 30% - 200% impressions, would could you attribute that to?

I thought at first search intent. That perhaps the search volume was lower but it's across multiple phrases in an account I just took over.

What else can cause impression loss without rank loss?

Thanks in advance for any insight you have.
Cheers!
Barb

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