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I'm on 3.15 and I've noticed the IR not working on wakeup a handful of times.
Usually putting it back to sleep and waking it up is enough to fix it, sometimes a full power cycle is necessary.
I've suspected it might be caused by a section of the screen registering a touch at wakeup (like maybe dirt or a drop of moisture or oil on the screen or something) but it doesn't happen frequently enough for me to diagnose it.
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