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Aha!

I observed the same thing late last year when I use a foldable wristpad with magnets inside that I got from an AT&T booth at a tech conference.

So this is not limited to that specific LG display. Mine is an LG 24MA32D that I bought about 3 years ago.

One wonders if the 2.4ghz USB3 interference [1] also messes with it, keep your external drives away!

I have a USB-C to USB-A hub and a USB 3.0 external HD connected via converter both connected to my LG 5k. No issues so far on either end.

My network is mostly 5Ghz w/ a Google Wifi