I've confirmed it's the cover (again) that is not working.
I took a magnetic screwdriver, and as soon as I get near the sleep magnet detector, which is about 2cm left and up from the lower right corner of the screen (so, in the text area), the KA1 goes to sleep. I don't even have to touch the screen.
Even more so, it goes to sleep *EVERY TIME*. It works even when I do stuff like waking the reader up by lifting the magnet and then lowering it again half through its wake-up cycle. The reader finishes the wake-up, and then goes back to sleep again.
In short: with the current 4.2.1180 firmware, the sleep function works reliably *IF* the cover has a magnet that is large enough and positioned correctly.
Now... am I going to take another gamble on ANOTHER third party cover, or should I go to a store in town which has the official cover in stock?
The €50 price tag of the original cover is quite high for what it is, but I can live with that if it works perfectly and reliably. The one thing I don't know is if I will like the possibly floppy lid due to the stand function.
Maybe I'll take the reader with me and see if I can put it into the cover in the store.
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