Apple’s iOS 27 includes a bug that can make your iPhone temporarily unresponsive, but it only if you go out of your way to trigger it.

iOS 27 features a Notification Center bug.

iOS 27 features a Notification Center bug.
While the iOS 27 update refined Apple’s Liquid Glass aesthetic, the software also brought with it an apparent user interface bug. Quickly toggling and switching between the Control Center and Notification Center can seemingly make devices unresponsive.
In essence, the bug needs to be triggered deliberately by quickly opening the Notification Center, then immediately activating the Control Center. Unless you’re testing animations or how well iOS 27 runs on your iPhone, there’s no point in repeatedly switching between the two UI elements like this.