Apple has officially released the iOS 27 update, which aims to improve system responsiveness. However, users have reported a significant bug: performing a specific gesture—simultaneously pulling down the notification center and the control center—can cause the iPhone to freeze, become unresponsive to touch, or experience severe lag.
Testing on an iPhone 17 confirmed the issue. When the bug is triggered, the screen stops responding to touch inputs. Users currently have to rely on Siri to force a restart of the device to restore normal functionality. Some users suggest that the issue occurs more frequently when pulling down the status bar partially with one hand and then quickly pulling down the control center with the other.
While some users noted improved overall system fluidity after the update, others reported frame drops and general performance issues. Apple's customer support acknowledged that the system may not be fully stable immediately following the release and suggests that users monitor their device performance before deciding to update.
For those experiencing significant battery drain or persistent application lag after installing iOS 27, Apple support recommends downgrading to version 26.6.1. Users can contact official support channels to request assistance with the rollback process.
