I haven't lost a book like that. I have accidentally marked a book as finished so that it disappeared from the Home page. But, I was able to find it in the library list.
I have had books disappear when opening them. But, in each case it was because of a problem with the book. Or an inconsistency between the book and the internal database. The latter has occurred when I have modified an epub and replaced it on the device. Depending on the changes made, this can cause problems. In most cases, it means the TOC won't work. But, occasionally, it has caused the device to reboot and the book can get removed when that happens. In any case, when it happened, it was obvious that something went wrong.
As to temperature, I haven't used either my Touch or Glo at over 35ºC, but I am expecting to tomorrow. But maybe I'll just spend the day at Maccas.
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