Its the proximity censor and it was also visible in one ui 5.. so its hardware

If it works, do tell me

1. Turn off the phone2. Connect the phone to a powered-on computer using a power cable3. Press and hold the Volume up and Power buttons simultaneously4. Release the Power button when the Samsung logo appears, but keep holding Volume upThe phone shoul...

You can try clearing system cache..It fixed most of heating and battery issues on my A73

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