Apple seems to have introduced an "activity timer" into iOS 18.1 that reboots devices after a set period of time, making it harder to break into them.

Apple added an inactivity timer that reboots iPhones to a more secure state when they haven’t been unlocked in a while.

Law enforcement officials in Detroit, Michigan are warning other police officers about an alleged iPhone change that causes Apple devices stored

Law enforcement agencies around the country are scrambling to check confiscated iPhones after a report they may be automatically locking themselves down. Police in Detroit have circulated a document that suggests iOS 18 added an unannounced security feature that causes the phones to reboot.