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_Daniel__
User level: Level 1 (4 points)

iPhone 15 Pro power button and screen have delayed response after iOS 27 update

Iphone 15 Pro

Power button does not respond immediately, it takes 3-4 seconds. You'll wake up after several push-ups. The same problem occurs when you tap on the screen and wake up to multiple taps.This error occurred after ios 27 update.

Posted on Sep 17, 2026 9:25 PM

1 reply

Mac Jim ID
User level: Level 10 (105,996 points)

Sep 17, 2026 9:43 PM in response to _Daniel__

You should expect some UI lag immediately after the update, but I have not seen it to be 3-4 seconds when pressing the power button. In that case I would recommend contacting Apple for diagnostics to be performed on your device.

Contact Apple Support - Apple Support


You may want to try a Force Restart first, as that will do some additional housekeeping after the update

  • Press and quickly release Volume up
  • Press and quickly release Volume down
  • Press and HOLD Side button until the Apple logo appears. This may take up to 15 seconds while holding the side button and you have to ignore anything else on the screen including the prompt to Slide to Power Off.


The UI lag I was referring to is due to the background processes indexing the files after the update and is not specific to iOS 27, it happens after other updates too and typically lasts for about 4 days. Along with the UI lag, there is also increased battery usage and you can expect the phone will feel warmer. It always helps to leave your phone plugged in overnights to let those processes finish quicker. Here is the Support Article that Apple provides that provides additional information about what to expect after the update.

About Apple software updates - Apple Support


Originally posted at discussions.apple.com/thread/256359423