I don't know about the powering back on issue. I got so sick of waking up to a half drained battery that I set the KT to turn off after 30min.
I'll update in a few days when I've had 1.9.9 longer, but to answer a question from earlier in this thread: After I updated to 1.9.8 the very first time I tapped to turn a page, one solid tap (very definitely only one), it turned two pages. And it has happened many times since. The update has absolutely not fixed it.
I've also found that when I power off from mid-book, then turn it back on and go back to my book, I'm one page behind my stopping point. Not a big deal, but a bit weird and ostensibly very easy to fix.