There's definitely something odd going on with your reader (aside from the possibility that they changed some inner workings of the touch activation mucking it up). But you're having very odd issues indeed.
When I first started reading outside I even was testing whether having the screen half lit with direct sun and half in shade would cause any issues, and the touch worked perfectly there too (and surprisingly was still a joy to read, the contrast was excellent on both the sunlit half and the shaded half). Reading indoors I haven't had any issues under fluorescent, incandescent, or CFL lamps. I just dug up an old halogen lamp I don't use anymore, and it works perfect under that as the sole light source as well. And I stood in my totally dark closet just for the heck of it, works perfectly there too, responsive on first swipe under all conditions no matter where I am.
So for my reader, the light source, quality, quantity, glaring sun or total darkness or split screen with different lighting on it, has zero effect on the infrared touch for me. It works perfect under all conditions. I'm at a loss why yours is being so weird.
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