Apple rolled out iOS 27, its new operating system for the iPhone, on September 14. The update comes preinstalled on the new iPhone 18 series, and it is also available for older iPhone models. But many users say their phone's touchscreen has stopped responding properly after installing iOS 27. Others have complained about slower overall performance and jittery app animations.

In several posts on Reddit, users reported that parts of the iPhone screen sometimes do not respond to touch at all, with the problem most noticeable when swiping across the display. Some users added that the phone has become so slow that it is hard to get work done on it.

While the complaints have been widely discussed on social media, Apple has not commented on the matter. One Reddit user said restarting the iPhone brought the touchscreen back to normal, though he was not sure whether that was a permanent fix. Another user noted that having too many app icons on the home screen can make animations stutter when an app is launched, and suggested reducing the number of apps on the home screen.

According to technology experts, a number of background tasks run on the iPhone after a new operating system version is installed, including reorganizing and indexing the data stored on the device. These processes can make the phone feel slower or cause animations to stutter. If the problems continue even after those tasks are complete, users may have to wait for the next software update to resolve them.

The article is based on a TechRadar report.