For those who keep having the battery drain issue: Based on the release notes from the Goodereader page, it seems to be tied to syncing (automatically even when "asleep"). Have you tried manually disabling WiFi and only enable it for the duration of a manual sync?
I know it's less convenient, but I have always being doing that with all my readers to maximise battery life, and thus also with the KA1, and at least that is one issue I haven't had, even with the previous firmware...
And in terms of unhelpful customer support: I know it's frustrating on your end, but on the other side the rep cannot magically come up with a solution or fix the firmware, that's the job of the engineer(s), who conveniently don't interface with you... and while the rep can forward the issue, they cannot enforce any kind of urgency.
Sometimes all the rep can do is try to be polite and suggest a generic solution, even if he/she knows it won't do much :/
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