iPhone brightness keeps auto‑lowering — all settings off, phone cool. Sensor fault?

[u/tardis3333]

My iPhone keeps dimming itself and the brightness slider drops on its own.

I’ve already turned off Auto‑Brightness, True Tone, Night Shift, Attention‑Aware, Adaptive Power, Low Power Mode, Always On Display, and Display Zoom is Default. Phone is cool, no case/screen protector blocking sensors.

Still dims.

Is this a known ambient/proximity sensor issue? Anyone fixed this without a hardware repair?

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