There is a 5.4.0.1 update.
I don't think I've had this problem and have been using immersion reading a lot lately. But it is possible I have not gone full 5 minutes (current setting) without touching it for some reason or other. I think it does go off after 5 minutes of TTS. But I would need to test to be sure of either 'finding'. But these are for a Fire HD7 (2017).
I have not used my HD6 in awhile, I don't know if it was different, but I remember increasing screen timeout so it wouldn't turn off so soon when doing TTS, and turned on a Developer Option so it would stay awake while charging.
How are your Maximize Battery Life settings? I have Low Power Mode off. If that's on, perhaps it is more aggressive about turning off display.
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