I'd suggest calling Kindle CS, I'm not sure they're aware of this.
At any rate, that's what I'll be doing tomorrow myself, given that restarts/resets don't do a thing, it seems pretty much hardware related.
AFAICT, in my case it also seems to be triggered when the Kindle gets somewhat warmer (ie. after prolonged use, or in the sun). While it usually takes a couple of hours to see this behaviour, yesterday I was reading outside, right under the sun, and 2 minutes later, slow page turns that didn't go away until I went somewhere a bit colder.
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