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iMore Question
I notice on very rare occasions if my iPhone is flat on a surface (not facing down) the screen just randomly turns on by itself. It is however very rare. Is the sensor messed up or something?
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A power surge may cause that if it's plugged in. If it's not plugged in, it's probably a notification that didn't quite show on the screen. Turn all all your notifications off for lockscreen. See if it still happens. If not, turn one on at a time. You might find the culprit that way. Most likely an app notification.

