Is your iPhone rebooting after being inactive? It's a feature, not a bug
Briefly

"Apple's new inactivity reboot feature, introduced in iOS 18, enhances the security of iPhones by making them harder to access after a period of time, thus protecting user data."
"Law enforcement officials reported that during forensic examinations, the iPhones would unexpectedly reboot, complicating attempts to unlock them for data retrieval."
"Experts identified this inactivity timer in the code of iOS 18, noting that it causes a device in an AFU state to reboot to a BFU state after approximately 96 hours."
"This mechanism is similar to the Mac’s hibernation mode, acting as a safeguard against unauthorized access, not dependent on network connectivity or battery life."
Read at ZDNET
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