Plex phoning home several times a second?

I’m running Plex (official Docker container on x64, Ubuntu 18.04) and recently noticed in my PiHole logs that it is phoning home several times a second, all day long, tens of thousands of queries a day, even when I’m not watching video. I only use it in-house on my local wired LAN.

Can someone tell me just what is Plex doing that is generating all these calls? I’m considering blocking it, I don’t need the unnecessary traffic.

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