This problem has persisted for almost a month now, ot all started when I used USB tethering hot spot to my laptop and after disconnecting it, it kept on popping that notification, and my screen can't go to sleep. It only sleeps when I plug into the charger or OTG.
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I do and I've encountered the same issue (on and off) - even after the phone has been sent in to have the sub board and an internal cable replaced. Why do you think night mode might have something to do with it?